View source for Red wolf

{{Short description|Canid native to the southeastern United States}}
{{About|the wild canine}}
{{use dmy dates|cs1-dates=ly|date=May 2023}}
{{Speciesbox
| fossil_range = [[Holocene]] 10,000 years ago – present<ref name=nowak2002/>
| status = CR
| status_system = IUCN3.1
| status_ref = <ref name=IUCN />
| status2 = LE
| status2_system = ESA
| status2_ref = <ref name=ecos>{{Cite web|url=https://ecos.fws.gov/ecp/species/37|title =Red wolf (''Canis rufus'')|website=Environmental Conservation Online System|publisher=U.S. Fish & Wildlife Service|access-date=30 April 2023}}</ref><ref>{{Federal Register|32|4001}}</ref>
| image = Red wolf (4531335218).jpg
| image_caption = A red wolf showing typical coloration
| genus = Canis
| species = rufus
| authority = [[John James Audubon|Audubon]] & [[John Bachman|Bachman]], 1851<ref name=audubon1851/>
| subdivision_ranks = Subspecies
| subdivision = * [[Extinction|{{Extinct}}]]''[[Florida black wolf|C. r. floridanus]]''<ref name=goldman1937/>
* ''[[Gregory's wolf|C. r. gregoryi]]''<ref name=goldman1937/>
* {{Extinct}}''[[Texas red wolf|C. r. rufus]]''<ref name=goldman1937/>
| range_map = Red Wolf Range.jpg
| range_map_caption = Original range
| range_map2 = Canis rufus range IUCN.png
| range_map2_caption = The red wolf's distribution on the [[Albemarle-Pamlico Peninsula]]
}}

The '''red wolf''' ('''''Canis rufus''''')<ref name=IUCN /><ref name=goldman1937/><ref name=MDD/> is a [[Canis|canine]] native to the [[southeastern United States]]. Its size is intermediate between the [[coyote]] (''Canis latrans'') and [[Wolf|gray wolf]] (''Canis lupus'').<ref name=paradiso1971/>

The red wolf's taxonomic classification as being a separate species has been contentious for nearly a century, being considered either a subspecies of the gray wolf ''Canis lupus rufus'',<ref name=COL2018r/><ref name=wozencraft2005/> or a [[coywolf]] (a [[genetic admixture]] of wolf and coyote). Because of this, it is sometimes excluded from endangered species lists, despite its critically low numbers.<ref name=paradiso1972 /><ref name=woodward1980 /> Under the [[Endangered Species Act of 1973]], the [[U.S. Fish and Wildlife Service]] recognizes the red wolf as an [[endangered species]] and grants it protected status.<ref name=ecos/> Since 1996, the [[IUCN]] has listed the red wolf as a [[Critically Endangered]] species;<ref name=IUCN>{{cite iucn |author=Phillips, M. |date=2018 |title=''Canis rufus'' |errata=2020 |article-number=e.T3747A163509841 |doi=10.2305/IUCN.UK.2018-2.RLTS.T3747A163509841.en |access-date=15 June 2022}}</ref> however, it is not listed in the [[CITES#Appendices|CITES Appendices]] of endangered species.<ref>{{cite web |url=https://cites.org/eng/app/appendices.php |title=Appendices |website=CITES |access-date=26 November 2021}}</ref>

==History==
Red wolves were once distributed throughout the southeastern and south-central United States from the Atlantic Ocean to central Texas, southeastern Oklahoma and southwestern Illinois in the west, and in the north from the [[Ohio River Valley]], northern [[Pennsylvania]], southern [[New York (state)|New York]], and extreme southern [[Ontario]] in [[Canada]]<ref name=IUCN/> south to the [[Gulf of Mexico]].<ref name=Hinton2013>{{cite journal |first1=Joseph W. |last1=Hinton |first2=Michael J. |last2=Chamberlain |first3=David R. Jr. |last3=Rabon |date=August 2013 |title=Red Wolf (''Canis rufus'') Recovery: A review with suggestions for future research |journal=Animals |volume=3 |issue=3 |pages=722–724 |doi=10.3390/ani3030722 |pmc=4494459 |pmid=26479530|doi-access=free }}</ref> The red wolf was nearly driven to extinction by the mid-1900s due to aggressive predator-control programs, [[habitat destruction]], and extensive [[Coywolf|hybridization with coyotes]]. By the late 1960s, it occurred in small numbers in the [[Gulf Coast of the United States|Gulf Coast]] of western [[Louisiana]] and eastern [[Texas]].

Fourteen of these survivors were selected to be the founders of a [[Captive breeding|captive-bred]] population, which was established in the [[Point Defiance Zoo and Aquarium]] between 1974 and 1980. After a successful experimental relocation to [[Bull Island (South Carolina)|Bulls Island]] off the coast of [[South Carolina]] in 1978, the red wolf was declared [[extinct in the wild]] in 1980 so that restoration efforts could proceed. In 1987, the captive animals were released into the [[Alligator River National Wildlife Refuge]] (ARNWR) on the [[Albemarle-Pamlico Peninsula|Albemarle Peninsula]] in [[North Carolina]], with a second unsuccessful release taking place two years later in the [[Great Smoky Mountains National Park]].<ref name="hendry">{{Cite journal |last=Hendry |first=D. |year=2007 |title=Red Wolf Restoration: A 20&nbsp;year journey |url=https://wolf.org/wp-content/uploads/2013/12/winter2007.pdf |journal=International Wolf Center |volume=17 |page=4}}</ref> Of 63&nbsp;red wolves released from 1987 to 1994,<ref name=Gese /> the population rose to as many as 100–120&nbsp;individuals in 2012, but due to the lack of regulation enforcement by the [[United States Fish and Wildlife Service|US Fish and Wildlife Service]], the population has declined to 40&nbsp;individuals in 2018,<ref>{{cite web |url=https://www.msn.com/en-us/news/us/government-wild-red-wolf-population-could-soon-be-wiped-out/ar-AAwhTsC?ocid=ACERDHP15 |title=Government: Wild red wolf population could soon be wiped out |website=www.msn.com |language=en-US |access-date=2018-04-25 |archive-url=https://web.archive.org/web/20180425183138/https://www.msn.com/en-us/news/us/government-wild-red-wolf-population-could-soon-be-wiped-out/ar-AAwhTsC?ocid=ACERDHP15 |archive-date=2018-04-25 }}</ref> about 14 in 2019 <ref name=press-releases-2019-10-29>{{cite press release |url=https://biologicaldiversity.org/w/news/press-releases/report-20000-square-miles-red-wolf-habitat-open-urgently-needed-reintroductions-2019-10-29/ |title=Report: 20,000 Square Miles of Red Wolf Habitat is Open for Urgently Needed Reintroductions |publisher=Center for Biological Diversity |language=en |access-date=2019-11-02 |date=2019-10-29}}</ref> and 8 as of October 2021.<ref name="Wolf Conservation Center"/> No wild litters were born between 2019 and 2020.<ref name="Wolf Conservation Center">{{Cite web |title=Red Wolf |publisher=Wolf Conservation Center |url=https://nywolf.org/learn/red-wolf/ |access-date=2023-03-12}}</ref>

Under pressure from conservation groups, the US Fish and Wildlife Service resumed reintroductions in 2021 and increased protection. In 2022, the first wild litter was born since 2018. As of 2023, there are between 15 and 17 wild red wolves in ARNWR.<ref name=":5">{{Cite web |title=Red Wolf Recovery Program {{!}} U.S. Fish & Wildlife Service |website=FWS.gov |date=4 April 2022 |language=en |url=https://www.fws.gov/project/red-wolf-recovery-program |access-date=2023-03-12}}</ref>

== Description and behavior ==
[[File:Canis rufus 1 - Syracuse Zoo.jpg|thumb|A red wolf]]
The red wolf's appearance is typical of the genus ''Canis'', and is generally intermediate in size between the coyote and gray wolf, though some specimens may overlap in size with small gray wolves. A study of ''Canis'' [[morphometrics]] conducted in eastern North Carolina reported that red wolves are morphometrically distinct from coyotes and hybrids.<ref name=":0">{{cite journal |title=Morphometrics of ''Canis'' taxa in eastern North Carolina |journal=Journal of Mammalogy |date=2014-08-22 |issn=0022-2372 |pages=855–861 |volume=95 |issue=4 |doi=10.1644/13-MAMM-A-202 |first1=Joseph W. |last1=Hinton |first2=Michael J. |last2=Chamberlain|doi-access=free }}</ref> Adults measure 136–165&nbsp;cm (53.5–65&nbsp;in) in length, comprising a tail of about 37&nbsp;cm (14.6&nbsp;in).<ref name=paradiso1972/><ref name=":0" /> Their weight ranges from 20 to 39&nbsp;kg (44–85&nbsp;lbs) with males averaging 29&nbsp;kg (64&nbsp;lbs) and females 25&nbsp;kg (55&nbsp;lbs).<ref name=":0" /> Its pelage is typically more reddish and sparsely furred than the coyote's and gray wolf's, though melanistic individuals do occur.<ref name=paradiso1972>{{cite journal |last1=Paradiso |first1=J.L. |last2=Nowak |first2=R.M. |year=1972 |title=''Canis rufus'' |url=http://www.science.smith.edu/msi/pdf/i0076-3519-022-01-0001.pdf |journal=Mammalian Species |issue=22 |pages=1–4 |doi=10.2307/3503948 |jstor=3503948 |s2cid=253917285 |archive-url=https://web.archive.org/web/20140416191724/http://www.science.smith.edu/msi/pdf/i0076-3519-022-01-0001.pdf |archive-date=2014-04-16}}</ref> Its fur is generally tawny to grayish in color, with light markings around the lips and eyes.<ref name=woodward1980/> The red wolf has been compared by some authors to the [[greyhound]] in general form, owing to its relatively long and slender limbs. The ears are also proportionately larger than the coyote's and gray wolf's. The skull is typically narrow, with a long and slender [[Rostrum (anatomy)|rostrum]], a small braincase and a well developed [[sagittal crest]]. Its [[cerebellum]] is unlike that of other ''Canis'' species, being closer in form to that of canids of the ''[[Vulpes]]'' and ''[[Urocyon]]'' [[genera]], thus indicating that the red wolf is one of the more [[plesiomorphic]] members of its genus.<ref name=paradiso1972 />

The red wolf is more sociable than the coyote, but less so than the gray wolf. It mates in January–February, with an average of 6–7&nbsp;pups being born in March, April, and May. It is monogamous, with both parents participating in the rearing of young.<ref name=":1">{{cite journal |title=Space and habitat use by a Red Wolf pack and their pups during pup-rearing |journal=[[Journal of Wildlife Management]] |date=2010-01-01 |issn=1937-2817 |pages=55–58 |volume=74 |issue=1 |doi=10.2193/2008-583 |first1=Joseph W. |last1=Hinton |first2=Michael J. |last2=Chamberlain |bibcode=2010JWMan..74...55H |s2cid=43971629}}</ref><ref>{{Cite journal |title=Helper effects on pup lifetime fitness in the cooperatively breeding red wolf (''Canis rufus'') |journal=Proceedings of the Royal Society of London B: Biological Sciences |date=2011-05-07 |issn=0962-8452 |pmc=3061142 |pmid=20961897 |pages=1381–1389 |volume=278 |issue=1710 |doi=10.1098/rspb.2010.1921 |first1=Amanda M. |last1=Sparkman |first2=Jennifer |last2=Adams |first3=Arthur |last3=Beyer |first4=Todd D. |last4=Steury |first5=Lisette |last5=Waits |first6=Dennis L. |last6=Murray}}</ref> Denning sites include hollow tree trunks, along stream banks and the abandoned earths of other animals. By the age of six weeks, the pups distance themselves from the den,<ref name=":1" /> and reach full size at the age of one year, becoming [[sexual maturity|sexually mature]] two years later.<ref name=woodward1980 />

Using long-term data on red wolf individuals of known pedigree, it was found that [[inbreeding]] among first-degree relatives was rare.<ref name=Sparkman>{{cite journal |last1=Sparkman |first1=A.M. |last2=Adams |first2=J.R. |last3=Steury |first3=T.D. |last4=Waits |first4=L.P. |last5=Murray |first5=D.L. |date=July 2012 |title=Pack social dynamics and inbreeding avoidance in the cooperatively breeding red wolf |journal=Behavioral Ecology |volume=23 |issue=6 |pages=1186–1194 |doi=10.1093/beheco/ars099|doi-access=free |hdl=10.1093/beheco/ars099 |hdl-access=free }}</ref> A likely mechanism for avoidance of inbreeding is independent dispersal trajectories from the natal pack. Many of the young wolves spend time alone or in small non-breeding packs composed of unrelated individuals. The union of two unrelated individuals in a new home range is the predominant pattern of breeding pair formation.<ref name=Sparkman /> Inbreeding is avoided because it results in progeny with reduced fitness ([[inbreeding depression]]) that is predominantly caused by the [[Zygosity#Homozygosity|homozygous]] expression of recessive deleterious alleles.<ref name="pmid19834483">{{cite journal |author1=Charlesworth, D. |author2=Willis, J.H. |title=The genetics of inbreeding depression |journal=Nat. Rev. Genet. |volume=10 |issue=11 |pages=783–796 |year=2009 |pmid=19834483 |doi=10.1038/nrg2664 |s2cid=771357 }}</ref>

Prior to its extinction in the wild, the red wolf's diet consisted of rabbits, rodents, and [[nutria]] (an introduced species).<ref name=Shaw>{{cite thesis |author=Shaw, J. |year=1975 |title=Ecology, behavior and systematic of the red wolf (''Canis rufus'') |type=Ph.D. |publisher=Yale University |place=New Haven, CT}}</ref> In contrast, the red wolves from the restored population rely on [[white-tailed deer]], [[pig]], [[raccoon]], [[Oryzomys|rice rat]]s, [[muskrat]]s, nutria, rabbits and [[carrion]].<ref>{{Cite journal |title = Food Habits of Red Wolves during Pup-Rearing Season |journal=Southeastern Naturalist |date=2011-12-01 |issn=1528-7092 |pages=731–740 |volume=10 |issue=4 |doi=10.1656/058.010.0412 |first1=Justin A. |last1=Dellinger |first2=Brian L. |last2=Ortman |first3=Todd D. |last3=Steury |first4=Justin |last4=Bohling |first5=Lisette P. |last5=Waits|s2cid=32434436 }}</ref><ref>{{Cite journal |title=Diets of sympatric red wolves and coyotes in northeastern North Carolina |journal=Journal of Mammalogy |date=2013-10-15 |issn=0022-2372 |pages=1141–1148 |volume=94 |issue=5 |doi=10.1644/13-MAMM-A-109.1 |first1=Justin M. |last1= McVey |first2=David T. |last2=Cobb |first3=Roger A. |last3=Powell |first4=Michael K. |last4=Stoskopf |first5=Justin H. |last5=Bohling |first6=Lisette P. |last6=Waits |first7=Christopher E. |last7=Moorman |s2cid=43925119}}</ref><ref>{{cite web | url=https://animaldiversity.org/accounts/Canis_rufus/ | title=Canis rufus (Red wolf) | website=[[Animal Diversity Web]] }}</ref> White-tailed deer were largely absent from the last wild refuge of red wolves on the Gulf Coast between Texas and Louisiana (where specimens were trapped from the last wild population for captive breeding), which likely accounts for the discrepancy in their dietary habits listed here. Historical accounts of wolves in the southeast by early explorers such as [[William Hilton Jr|William Hilton]], who sailed along the Cape Fear River in what is now North Carolina in 1644, also note that they ate deer.<ref name="ref36">{{Cite journal |last=Powell |first=W.S. |year=1973 |title=Creatures of North Carolina from Roanoke Island to Purgatory Mountain |journal=North Carolina Historical Review |volume=50 |issue=2 |pages=155–168 |jstor=23528936}}</ref>

===Predation===
In Florida, red wolves may be eaten by some growth stage of invasive snakes like [[Burmese python]]s, [[reticulated python]]s, [[Southern African rock python]]s, [[Central African rock python]]s, [[boa constrictor]]s, [[yellow anaconda]]s, [[Bolivian anaconda]]s, [[dark-spotted anaconda]]s, and [[green anaconda]]s.<ref>{{Cite book|title=Final Environmental Assessment For Large Constrictor Snakes As Injurious Wildlife under the Lacey Act|date=January 2012|publisher=U.S. Fish and Wildlife Service}}</ref>

== Range and habitat ==
[[File:Canis rufus historic distribution (Young and Goldman, 1944).png|left|thumb|Historical distribution of ''Canis rufus'' subspecies<ref name="goldman1944" />]]
[[File:Mapa distribución lobo rojo (canis rufus).png|right|thumb|Historical range of the red wolf]]
The originally recognized red wolf range extended throughout the [[southeastern United States]] from the Atlantic and Gulf Coasts, north to the Ohio River Valley and central Pennsylvania, and west to [[Central Texas]] and southeastern Missouri.<ref name="ref18">{{cite web |publisher=U.S. Fish and Wildlife Service |year=1997 |title=Endangered Red Wolves |url=http://library.fws.gov/Pubs4/endangered_red_wolves.pdf |page=7 |access-date=2011-04-28  |archive-date=2010-05-27  |archive-url=https://web.archive.org/web/20100527092132/http://library.fws.gov/Pubs4/endangered_red_wolves.pdf }}</ref> Research into paleontological, archaeological and historical specimens of red wolves by Ronald Nowak expanded their known range to include land south of the Saint Lawrence River in Canada, along the eastern seaboard, and west to Missouri and mid-Illinois, terminating in the southern latitudes of Central Texas.<ref name=nowak2002 />

Given their wide historical distribution, red wolves probably used a large suite of habitat types at one time. The last naturally occurring population used coastal prairie marshes, swamps, and agricultural fields used to grow rice and cotton. However, this environment probably does not typify preferred red wolf habitat. Some evidence shows the species was found in highest numbers in the once extensive [[Bottomland forest|bottom-land river forests]] and swamps of the southeastern United States. Red wolves reintroduced into northeastern North Carolina have used habitat types ranging from agricultural lands to forest/wetland mosaics characterized by an [[Canopy (botany)|overstory]] of pine and an [[understory]] of evergreen shrubs. This suggests that red wolves are habitat generalists and can thrive in most settings where prey populations are adequate and persecution by humans is slight.<ref name=phillips2003/>

=== Extirpation in the wild ===
[[File:The fur animals of Louisiana (1931) Louisiana black wolf.png|thumb|Melanistic red wolf at [[Audubon Park, New Orleans]] (1931).]]
In 1940, the biologist [[Stanley Paul Young|Stanley P. Young]] noted that the red wolf was still common in eastern Texas, where more than 800 had been caught in 1939 because of their attacks on livestock. He did not believe that they could be exterminated because of their habit of living concealed in thickets.<ref name=young1940/> In 1962 a study of skull morphology of wild ''Canis'' in the states of Arkansas, Louisiana, Oklahoma, and Texas indicated that the red wolf existed in only a few populations due to hybridization with the coyote. The explanation was that either the red wolf could not adapt to changes to its environment due to human land-use along with its accompanying influx of competing coyotes from the west, or that the red wolf was being hybridized out of existence by the coyote.<ref name=mccarley1962/>

===Reintroduced habitat===
Since 1987, red wolves have been released into northeastern North Carolina, where they roam 1.7&nbsp;million acres.<ref name="ref22">{{cite web |title=Current Red Wolf Facts |website=Red Wolf Recovery |url=http://www.fws.gov/redwolf/index.html |access-date=5 July 2011 |archive-date=15 January 2009 |archive-url=https://web.archive.org/web/20090115202902/http://www.fws.gov/redwolf/index.html }}</ref> These lands span five counties (Dare, Hyde, Tyrrell, Washington, and Beaufort) and include three national wildlife refuges, a U.S. Air Force bombing range, and private land.<ref name="ref22" /> The red wolf recovery program is unique for a large carnivore reintroduction in that more than half of the land used for reintroduction lies on private property. Approximately {{convert|680000|acre|km2}} are federal and state lands, and {{convert|1002000|acre|km2}} are private lands.

Beginning in 1991, red wolves were also released into the Great Smoky Mountains National Park in eastern Tennessee.<ref name="ref19">{{cite web |publisher=U.S. Fish and Wildlife Service |year=1997 |title=Endangered Red Wolves |url=http://library.fws.gov/Pubs4/endangered_red_wolves.pdf |pages=8–9 |access-date=2011-04-28  |archive-date=2010-05-27  |archive-url=https://web.archive.org/web/20100527092132/http://library.fws.gov/Pubs4/endangered_red_wolves.pdf }}</ref> However, due to exposure to environmental disease (parvovirus), parasites, and competition (with coyotes as well as intraspecific aggression), the red wolf was unable to successfully establish a wild population in the park. Low prey density was also a problem, forcing the wolves to leave the park boundaries in pursuit of food in lower elevations. In 1998, the FWS took away the remaining red wolves in the Great Smoky Mountains National Park, relocating them to Alligator River National Wildlife Refuge in eastern North Carolina.<ref>{{cite web |publisher=National Park Service |url=https://www.nps.gov/grsm/learn/nature/mammals.htm |access-date=2014-08-06 |title=Mammals}}</ref> Other red wolves have been released on the coastal islands in Florida, Mississippi, and South Carolina as part of the captive breeding management plan.<ref name=":5" /> [[St. Vincent Island, Florida|St. Vincent Island]] in Florida is currently the only active island propagation site.<ref>{{Cite web |date=2025-05-28 |title=Red Wolves |url=https://stvincentfriends.com/program/red-wolves/ |access-date=2026-05-25 |website=Friends of St. Vincent National Wildlife Refuge |language=en-US}}</ref>

==Captive breeding and reintroduction==
[[File:Red wolf pups - captive breeding.jpg|thumb|upright|[[United States Fish and Wildlife Service|USFWS]] worker with red wolf pups, August&nbsp;2002]]
After the passage of the [[Endangered Species Act of 1973]], formal efforts backed by the U.S. Fish and Wildlife Service began to save the red wolf from extinction, when a [[Captive breeding|captive-breeding]] program was established at the [[Point Defiance Zoo & Aquarium|Point Defiance Zoological Gardens, Tacoma, Washington]]. Four hundred animals were captured from southwestern Louisiana and southeastern Texas from 1973 to 1980 by the USFWS.<ref name=Carley>{{cite report |author=Carley, C. |year=1975 |title=Activities and findings of the red wolf recovery program from late 1973 to July 1, 1975 |publisher=U.S. Fish and Wildlife Service |location=Albuquerque, NM}}</ref><ref name=McCarley1979>{{cite report |author=McCarley, H. |author2=J. Carley |name-list-style=amp |year=1979 |title=Recent changes in distribution and status of red wolves (''Canis rufus'') Endangered Species Report no.&nbsp;4 |publisher=U.S. Fish and Wildlife Service |location=Albuquerque, NM}}</ref>

Measurements, vocalization analyses, and skull X-rays were used to distinguish red wolves from coyotes and red wolf × coyote hybrids. Of the 400&nbsp;canids captured, only 43 were believed to be red wolves and sent to the breeding facility. The first litters were produced in captivity in May&nbsp;1977. Some of the pups were determined to be hybrids, and they and their parents were removed from the program. Of the original 43&nbsp;animals, only 17 were considered pure red wolves and since three were unable to breed, 14 became the breeding stock for the captive-breeding program.<ref name=McCarley1990>{{cite report |year=1990 |title=Red Wolf Recovery/Species Survival Plan |publisher=U.S. Fish and Wildlife Service |location=Atlanta, GA}}</ref> These 14 were so closely related that they had the genetic effect of being only eight individuals.{{Citation needed|date=May 2026}}

In 1996, the red wolf was listed by the [[IUCN|International Union for Conservation of Nature]] as a [[Critically Endangered|critically endangered species]].<ref name=IUCN/>

===20th century releases===
;1976 release in [[Cape Romain National Wildlife Refuge]]
:In December 1976, two wolves were released onto Cape Romain National Wildlife Refuge's Bulls Island in South Carolina with the intent of testing and honing reintroduction methods. They were not released with the intent of beginning a permanent population on the island.<ref name="ref35">{{cite conference |last=Carley |first=Curtis J. |title=Report on the Successful Translocation Experiment of Red Wolves (''Canis rufus'') to Bulls Island, S.C. |conference=Portland Wolf Symposium |place=Lewis and Clark College, Portland, Oregon |date=August 13–17, 1979}}</ref> The first experimental translocation lasted for 11&nbsp;days, during which a mated pair of red wolves was monitored day and night with remote telemetry. A second experimental translocation was tried in 1978 with a different mated pair, and they were allowed to remain on the island for close to nine months.<ref name="ref35" /> After that, a larger project was executed in 1987 to reintroduce a permanent population of red wolves back to the wild in the [[Alligator River National Wildlife Refuge]] (ARNWR) on the eastern coast of [[North Carolina]]. Also in 1987, Bulls Island became the first island breeding site. Pups were raised on the island and relocated to North Carolina until 2005.<ref>{{cite web |url=http://www.fws.gov/caperomain/redwolf.html |publisher=U.S. Fish and Wildlife Service |website=Cape Romain National Wildlife Refuge |title=Red Wolf |access-date=2010-03-03 |archive-date=2012-01-04 |archive-url=https://web.archive.org/web/20120104043938/http://www.fws.gov/caperomain/redwolf.html }}</ref>

;1986 release in Alligator River National Wildlife Refuge
:In September&nbsp;1987, four male-female pairs of red wolves were released in the Alligator River National Wildlife Refuge, in northeastern North Carolina, and designated as an experimental population. Since then, the experimental population has grown and the recovery area expanded to include four national wildlife refuges, a Department of Defense bombing range, state-owned lands, and private lands, encompassing about {{convert|1700000|acre|km2}}.<ref name="ref20">{{cite report |publisher=USFWS |title=Red Wolf Recovery Program, 1st Quarter Report |date=October–December 2010 |place=Manteco, NC}}</ref>

;1989 release on Horn Island, Mississippi
:In 1989, the second island propagation project was initiated with release of a population on [[Horn Island (Mississippi)|Horn Island]] off the Mississippi coast.<ref>{{Cite news |last=Ap |date=1989-01-24 |title=Red Wolves Reintroduced On Gulf Isle |url=https://www.nytimes.com/1989/01/24/science/red-wolves-reintroduced-on-gulf-isle.html |access-date=2026-05-25 |work=The New York Times |language=en-US |issn=0362-4331}}</ref> This population was removed in 1998 because of a likelihood of encounters with humans. The third island propagation project introduced a population on [[St. Vincent Island, Florida]], offshore between [[Cape San Blas]] and [[Apalachicola, Florida]], in 1990, and in 1997, the fourth island propagation program introduced a population to [[Cape St. George Island]], Florida, south of Apalachicola.

;1991 release in the Great Smoky Mountains
:In 1991, two pairs were reintroduced into the [[Great Smoky Mountains National Park]], where the last known red wolf was killed in 1905. Despite some early success, the wolves were relocated to eastern North Carolina in 1998, ending the effort to reintroduce the species to the park.<ref>{{Cite web |last=Matheny |first=Jim |date=2019-11-14 |title=Red wolf experiment left lasting legacy in Smokies |url=https://www.wbir.com/article/entertainment/places/great-smoky-mountains-national-park/red-wolf-experiment-retrospective/51-70325188-0ab8-4a7e-b497-08375729d197 |access-date=2026-05-25 |website=wbir.com |language=en-US}}</ref>

===21st century status===
Over 30&nbsp;facilities participate in the red wolf [[Species Survival Plan]] and oversee the breeding and reintroduction of over 150&nbsp;wolves.<ref>{{cite web |url=http://www.pdza.org/page.php?id=296 |title=Red Wolf Conservation |publisher=Point Defiance Zoo & Aquarium |place=Tacoma, WA |access-date=2011-09-29 |archive-url=https://web.archive.org/web/20110524225431/http://www.pdza.org/page.php?id=296 |archive-date=2011-05-24}}</ref>

In 2007, the USFWS estimated that 300&nbsp;red wolves remained in the world, with 207 of those in captivity.<ref>{{cite web |publisher=U.S. Fish and Wildlife Service |url=http://ecos.fws.gov/docs/five_year_review/doc1155.pdf |year=2007 |title=Red Wolf (''Canis rufus'') 5&nbsp;Year Status Review: Summary and Evaluation}}</ref> By late 2020, the number of wild individuals had shrunk to only about 7 [[GPS animal tracking|radio-collared]] and a dozen uncollared individuals, with no wild pups born since 2018. This decline has been linked to shooting and poisoning of wolves by landowners, and suspended conservation efforts by the USFWS.<ref>{{Cite web |date=2020-11-18 |title=Wildlife Groups Challenge Red Wolf Rules {{!}} Coastal Review Online |url=https://www.coastalreview.org/2020/11/wildlife-groups-challenge-red-wolf-rules/|access-date=2021-01-13 |website=www.coastalreview.org|language=en-US}}</ref>

A 2019 analysis by the [[Center for Biological Diversity]] of available habitat throughout the red wolf's former range found that over 20,000&nbsp;square miles of [[public land]] across five sites had viable habitat for red wolves to be reintroduced to in the future. These sites were chosen based on prey levels, isolation from coyotes and human development, and connectivity with other sites. These sites include: the [[Apalachicola National Forest|Apalachicola]] and [[Osceola National Forest|Osceola]] National Forests along with the [[Okefenokee National Wildlife Refuge]] and nearby protected lands; numerous national parks and national forests in the [[Appalachian Mountains]] including the [[Monongahela National Forest|Monongahela]], [[George Washington and Jefferson National Forests|George Washington & Jefferson]], [[Cherokee National Forest|Cherokee]], [[Pisgah National Forest|Pisgah]], [[Nantahala National Forest|Nantahala]], [[Chattahoochee–Oconee National Forest|Chattahoochee]], and [[Talladega National Forest|Talladega]] National Forests along with [[Shenandoah National Park]] and the lower elevations of [[Great Smoky Mountains National Park]]; [[Croatan National Forest|Croatoan National Forest]] and Hofmann Forest on the [[North Carolina]] coast, and the [[Ozark–St. Francis National Forest|Ozark]], [[Ouachita National Forest|Ouatchita]], and [[Mark Twain National Forest|Mark Twain]] National Forests in the [[central United States]].<ref name="press-releases-2019-10-29"/>

In late 2018, two canids that are largely coyote were found on [[Galveston Island]], Texas with red wolf [[alleles]] (gene expressions) left from a [[ghost population]] of red wolves. Since these alleles are from a different population from the red wolves in the North Carolina captive breeding program, there has been a proposal to selectively cross-breed the Galveston Island coyotes{{efn|The purpose would be to selectively breed the animals to restore the lost red wolf genes to the current captive and experimental red wolf populations, while removing any introduced coyote genes. In addition to recovering the lost red wolf genetics, it would bolster the meager genetic diversity of the captive red wolves.}} into the captive red wolf population.<ref name="heppenheimer2018" /> Another study published around the same time analyzing canid scat and hair samples in southwestern Louisiana found genetic evidence of red wolf ancestry in about 55% of sampled canids, with one such individual having between 78 and 100% red wolf ancestry, suggesting the possibility of more red wolf genes in the wild that may not be present in the captive population.<ref name=":4" />

From 2015 to 2019, there were no red wolves released into the wild. But in March 2020, the FWS released a new breeding pair of red wolves, including a young male red wolf from St. Vincent Island, Florida into the Alligator River National Wildlife Refuge. The pair were unsuccessful at producing a litter of pups in the wild. On March 1, 2021, two male red wolves from Florida were paired with two female wild red wolves from eastern North Carolina and released into the wild. One of the male wolves was killed by a car shortly after being released into the wild. On April 30 and May 1, four adult red wolves were released into the wild and four red wolf pups were fostered by a wild female red wolf.<ref>{{Cite news|last=Sorg|first=Lisa|publisher=NC Policy Watch|date=May 19, 2021|title=Eight red wolves released west of Outer Banks, first time in years|url=https://www.obxtoday.com/n-c-policy-watch-eight-red-wolves-released-west-of-outerbanks-first-time-in-years/|access-date=2021-05-20|via=OBX Today|archive-date=2021-05-20 |archive-url=https://web.archive.org/web/20210520132634/https://www.obxtoday.com/n-c-policy-watch-eight-red-wolves-released-west-of-outerbanks-first-time-in-years/}}</ref> In addition to the eight released wolves, the total number of red wolves living in the wild amount to nearly thirty wild individuals, including a dozen other wolves not wearing radio collars.<ref>{{cite news |last=Kozak |first=Catherine |date=2021-05-17 |title=Groups release 8 captive red wolves into NC recovery area |work=CoastalReview |url=https://coastalreview.org/2021/05/8-captive-red-wolves-released-into-nc-recovery-area/}}</ref>

A study published in 2020 reported camera traps recorded "the presence of a large canid possessing wolf-like characters" in northeast Texas and later hair samples and tracks from the area indicated the presence of red wolves.<ref>{{cite journal |last=Ladine |first=Troy A. |date=2020 |title=The Red Wolf (''Canis rufus'') in East Texas |journal=The Southwestern Naturalist |volume=65 |issue=1 |pages=52–56|doi=10.1894/0038-4909-65.1.52 |bibcode=2021SWNat..65...52L }}</ref>

By fall of 2021, a total of six red wolves had been killed, including the four adults that had been released in the spring. Three of the released adults had been killed in vehicle collisions, two had died from unknown cases, and the fourth released adult had been shot by a landowner who feared the wolf was attempting to get his chickens. These losses dropped the number of wolves in the wild down to about 20 wild individuals. In the winter of 2021–2022, the Fish and Wildlife Services selected nine captive adult red wolves to be released into the wild. A family of five red wolves were released into the [[Pocosin Lakes National Wildlife Refuge]], while two new breeding pairs of adult wolves were released into the Alligator River National Wildlife Refuge. The release of these new wolves brought the number of wild red wolves in eastern North Carolina up to less than 30 wild individuals.{{citation needed|date=March 2022}}

On April 22, 2022, one of the [[breeding pair]]s of adult red wolves produced a litter of six wolf pups, four females and two males. This new litter of red wolf pups became the first litter born in the wild since 2018. As of 2023, there are between 15 and 17 wild red wolves in Alligator River National Wildlife Refuge.<ref name=":5" />

===Existing population===

In April and May 2023, two captive male red wolves were paired with two wild female wolves in acclimation pens and were later released into the wild. At the same time, the wild breeding pair that produced a litter of pups the previous year gave birth to a second litter of 5 pups, 2 males and 3 females. A male wolf pup from a captive litter was fostered into the pack, and with this new addition, the family of red wolves, which was named the Milltail pack by FWS, has grown to 13 wild individuals. These six new pups has brought the wild population of red wolves up to 23–25 wild individuals.

In May 2023, two families of red wolves were placed in acclimation pens to be released into the wild in the Pocosin Lakes National Wildlife Refuge in Tyrrell County. One family consisted of a breeding pair and three pups, while the other consisted of a breeding pair, a yearling female, and four young pups that were born in the acclamation pen. In early June 2023, the two families of red wolves were released into the wild to roam through PLNWR. With the addition of these two separate packs, the wild population of red wolves had increased to about 35 wild individuals. In addition to the wild population, there are approximately 270 red wolves in zoos and captive breeding programs across the U.S.

===Coyote × re-introduced red wolf issues===
Interbreeding with the coyote has been recognized as a threat affecting the restoration of red wolves. Adaptive management efforts are making progress in reducing the threat of coyotes to the red wolf population in northeastern North Carolina. Other threats, such as habitat fragmentation, disease, and human-caused mortality, are of concern in the restoration of red wolves. Efforts to reduce the threats are presently being explored.<ref name="ref22"/>

By 1999, introgression of coyote genes was recognized as the single greatest threat to wild red wolf recovery and an [[adaptive management]] plan which included coyote sterilization has been successful, with coyote genes being reduced by 2015 to less than 4% of the wild red wolf population.<ref name=Gese>{{cite journal |first1=Eric M. |last1=Gese |first2=Fred F. |last2=Knowlton |first3=Jennifer R. |last3=Adams |first4=Karen |last4=Beck |first5=Todd K. |last5=Fuller |first6=Dennis L. |last6=Murray |first7=Todd D. |last7=Steury |first8=Michael K. |last8=Stoskopf |first9=Will T. |last9=Waddell |first10=Lisette P. |last10=Waits |display-authors=6 |year=2015 |title=Managing hybridization of a recovering endangered species: The red wolf ''Canis rufus'' as a case study |journal=[[Current Zoology]] |volume=61 |number=1 |pages=191–205 |doi=10.1093/czoolo/61.1.191 |doi-access=free |url=http://www.currentzoology.org/temp/%7BD773D858-9D90-417A-B60E-C28FCB137D42%7D.pdf |access-date=2016-02-21 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303172203/http://www.currentzoology.org/temp/%7BD773D858-9D90-417A-B60E-C28FCB137D42%7D.pdf }}</ref>

Since the 2014 programmatic review, the USFWS ceased implementing the red wolf adaptive management plan that was responsible for preventing red wolf hybridization with coyotes and allowed the release of captive-born red wolves into the wild population.<ref>{{cite press release |first=Tom |last=MacKenzie |date=30 June 2015 |title=Service halts red wolf re‑introductions, pending examination of recovery program |website=fws.gov |publisher=U.S. [[Fish and Wildlife Service]] |url=http://www.fws.gov/news/ShowNews.cfm?ID=456CB36D-F587-7CD1-7021195729AF7928 |access-date=2023-11-30 |archive-url=https://web.archive.org/web/20160304121843/http://www.fws.gov/news/ShowNews.cfm?ID=456CB36D-F587-7CD1-7021195729AF7928 |archive-date=2016-03-04 }}</ref> Since then, the wild population has decreased from 100–115&nbsp;red wolves to less than&nbsp;30.<ref>{{cite news |first=Mark |last=Rumsey |date=14 August 2017 |title=2015&nbsp;Brings no conclusions on Red Wolf Recovery Program in eastern NC |type=radio news clip & transcript |website=[[WFAE]] 90.7&nbsp;FM (wfae.org) |place=Charlotte, NC |url=http://wfae.org/post/2015-brings-no-conclusions-red-wolf-recovery-program-eastern-nc |access-date=2023-11-30}}</ref> Despite the controversy over the red wolf's status as a unique taxon as well as the USFWS' apparent disinterest towards wolf conservation in the wild, the vast majority of public comments (including NC residents) submitted to the USFWS in 2017 over their new wolf management plan were in favor of the original wild conservation plan.<ref>{{cite press release |first1=Haley |last1=McKey |first2=Ron |last2=Sutherland |first3=Kim |last3=Wheeler |first4=Collette |last4=Adkins |first5=Maggie |last5=Howell |date=14 August 2017 |title=Public overwhelmingly supports protecting wild red wolves |website=www.biologicaldiversity.org |publisher=[[The Center for Biological Diversity]] |place=Washington, DC |url=https://www.biologicaldiversity.org/news/press_releases/2017/red-wolf-08-14-2017.php |access-date=2023-11-30 <!-- old 2017-09-25 url still redirects to new link, but still replaced it = https://www.biologicaldiversity.org/news/press_releases/2017/red-wolf-08-14-2017.php --> }}</ref>

A 2016 genetic study of canid scats found that despite high coyote density inside the Red Wolf Experimental Population Area (RWEPA), hybridization occurs rarely (4% are hybrids).<ref name=Justins2016_07/>

===Contested killing of re-introduced red wolves===
High wolf mortality related to [[Anthropogenic hazard|anthropogenic]] causes appeared to be the main factor limiting wolf dispersal westward from the RWEPA.<ref name=Justins2016_07>{{cite journal |title=Describing a developing hybrid zone between red wolves and coyotes in eastern North Carolina, USA |author1=Bohling, Justin H. |author2=Dellinger, Justin |author3=McVey, Justin M. |author4=Cobb, David T. |author5=Moorman, Christopher E. |author6=Waits, Lisette P. |name-list-style=amp |journal=Evolutionary Applications |date=July 2016 |volume=9 |issue=6 |pages=791–804 |doi=10.1111/eva.12388 |pmid=27330555 |pmc=4908465 |bibcode=2016EvApp...9..791B }}</ref>

In 2012, the [[Southern Environmental Law Center]] filed a lawsuit against the [[North Carolina Wildlife Resources Commission]] for jeopardizing the existence of the wild red wolf population by allowing nighttime hunting of coyotes in the five-county restoration area in eastern North Carolina.<ref name=":2">{{Cite web |title=Protection of Red Wolves |publisher=Animal Welfare Institute |url=https://awionline.org/cases/protection-red-wolves |website=awionline.org |access-date=2015-12-26}}</ref> A 2014 court-approved settlement agreement was reached that banned nighttime hunting of coyotes and requires permitting and reporting coyote hunting.<ref name=":2" /> In response to the settlement, the North Carolina Wildlife Resources Commission adopted a resolution requesting the USFWS to remove all wild red wolves from private lands, terminate recovery efforts, and declare red wolves extinct in the wild.<ref>{{cite news |publisher=N.C. Wildlife Resources Commission |title=[no title cited] |series=News Article |url=http://www.ncwildlife.org/Default.aspx?tabid=416&IndexId=10015 |website=www.ncwildlife.org |access-date=2015-12-26|url-status=dead}}</ref> This resolution came in the wake of a 2014 programmatic review of the red wolf conservation program conducted by The Wildlife Management Institute.<ref>{{cite web |title=WMI to Coordinate Comprehensive Review and Evaluation of the Red Wolf Recovery Program |url=https://www.wildlifemanagementinstitute.org/index.php?option=com_content&view=article&id=767:wmi-to-coordinate-review-and-evaluation-of-red-wolf-recovery-program&catid=34:ONB%2520Articles&Itemid=54 |publisher=Wildlife Management Institute |website=www.wildlifemanagementinstitute.org |access-date=2015-12-26 |archive-url=https://web.archive.org/web/20160122164728/https://www.wildlifemanagementinstitute.org/index.php?option=com_content&view=article&id=767:wmi-to-coordinate-review-and-evaluation-of-red-wolf-recovery-program&catid=34:ONB%2520Articles&Itemid=54 |archive-date=2016-01-22 }}</ref><ref>{{cite web |url=https://awionline.org/sites/default/files/press-release/AWI-WL-ResolutionUSFWSRedWolfExtinct-01302015.pdf |title=Resolution Requesting that the United States Fish and Wildlife Service Declare the Red Wolf (''Canis rufus'') Extinct in the Wild and Terminate the Red Wolf Reintroduction Program in Beaufort, Dare, Hyde, Tyrrell, and Washington Counties, North Carolina |date=January 29, 2015}}</ref><ref name=":3">{{Cite web |title=Red Wolf Recovery Program |website=www.fws.gov |url=http://www.fws.gov/redwolf/evaluation.html |access-date=2015-12-26 |archive-date=2015-11-24 |archive-url=https://web.archive.org/web/20151124001749/http://www.fws.gov/redwolf/evaluation.html }}</ref> The Wildlife Management Institute indicated the reintroduction of the red wolf was an incredible achievement. The report indicated that red wolves could be released and survive in the wild, but that illegal killing of red wolves threatens the long-term persistence of the population.<ref name=":3"/> The report stated that the USFWS needed to update its red wolf recovery plan, thoroughly evaluate its strategy for preventing coyote hybridization and increase its public outreach.<ref>{{Cite web |title=Wildlife Management Institute Releases New Report on Red Wolf Recovery Program |url=http://www.defenders.org/press-release/wildlife-management-institute-releases-new-report-red-wolf-recovery-program |publisher=Defenders of Wildlife |access-date=2015-12-26 |date=2014-11-20 |archive-date=2015-12-22 |archive-url=https://web.archive.org/web/20151222180138/http://www.defenders.org/press-release/wildlife-management-institute-releases-new-report-red-wolf-recovery-program}}</ref>

In 2014, the USFWS issued the first take permit for a red wolf to a private landowner.<ref>{{Cite web |title=USFWS Grants Landowner Permit to Kill Critically Endangered Red Wolf |publisher=Wolf Conservation Center |url=http://nywolf.org/home?p=9297 |website=nywolf.org |access-date=2015-12-26 |archive-url=https://web.archive.org/web/20150911235807/http://nywolf.org/home?p=9297 |archive-date=2015-09-11}}</ref> Since then, the USFWS issued several other take permits to landowners in the five-county restoration area. During June&nbsp;2015, a landowner shot and killed a female red wolf after being authorized a take permit, causing a public outcry.<ref>{{cite news |title=How management rule allows certain red wolf killings |newspaper=[[The News & Observer]] |url=http://www.newsobserver.com/opinion/op-ed/article35484480.html |department=Editorial |access-date=2015-12-26 |url-access=subscription|last=Miranda|first=Leopoldo|date=2015-09-16}}</ref><ref>{{cite news |first=Sierra |last=Weaver |title=No defense for death of red wolf |newspaper=[[The News & Observer]] |url=http://www.newsobserver.com/opinion/letters-to-the-editor/article36851709.html |department=Editorial |access-date=2015-12-26 |url-access=subscription|date=2015-09-28}}</ref> In response, the Southern Environmental Law Center filed a lawsuit against the USFWS for violating the Endangered Species Act.<ref>{{cite web |title=U.S. Fish and Wildlife faces lawsuit over red wolf program |url=http://www.newsobserver.com/news/local/article44780244.html |newspaper=News Observer |department=Editorial |access-date=2015-12-26 |url-access=subscription}}</ref>

By 2016, the red wolf population of North Carolina had declined to 45–60&nbsp;wolves. The largest cause of this decline was gunshot.<ref>{{cite journal |title=Survival and population size estimates of the red wolf |journal=The Journal of Wildlife Management |volume=81 |issue=3 |page=417 |year=2017 |last1=Hinton|first1=Joseph W. |last2=White |first2=Gary C. |last3=Rabon |first3=David R. |last4=Chamberlain |first4=Michael J. |doi=10.1002/jwmg.21206|bibcode=2017JWMan..81..417H }}</ref>

In June 2018, the USFWS announced a proposal that would limit the wolves' safe range to only Alligator River National Wildlife Refuge, where only about 35&nbsp;wolves remain, thus allowing hunting on private land.<ref>{{Cite news |title=Fish and Wildlife to allow open hunting of endangered wild red wolves in Southeast |first=Bo |last=Petersen |date=27 June 2018 |orig-date=Updated 14 Sep 2020 |url=https://www.postandcourier.com/news/fish-and-wildlife-to-allow-open-hunting-of-endangered-wild/article_2298d96e-7a11-11e8-96bd-b3434a1b6db8.html |newspaper=Post and Courier |access-date=2018-06-29 |language=en}}</ref><ref>{{cite web |url=https://www.fws.gov/southeast/news/2018/06/service-proposes-new-management-rule-for-non-essential-experimental-population-of-red-wolves-in-north-carolina/ |title=Service proposes new management rule for non-essential, experimental population of red wolves in North Carolina |publisher=U.S. Fish & Wildlife Service |website=www.fws.gov |language=en-US |access-date=2018-06-29 |archive-date=2018-06-28 |archive-url=https://web.archive.org/web/20180628232737/https://www.fws.gov/southeast/news/2018/06/service-proposes-new-management-rule-for-non-essential-experimental-population-of-red-wolves-in-north-carolina/ }}</ref> In November&nbsp;2018, Chief Judge [[Terrence W. Boyle]] found that the USFWS had violated its congressional mandate to protect the red wolf, and ruled that USFWS had no power to give landowners the right to shoot them.<ref name=fears2018/>

==Relationship to humans==
Since before [[European colonization of the Americas]], the red wolf has featured prominently in [[Cherokee spiritual beliefs]], where it is known as ''wa'ya'' (ᏩᏯ), and is said to be the companion of Kana'ti - the hunter and father of the ''[[Cherokee clans#Aniwaya|Aniwaya]]'' or Wolf Clan.<ref>{{cite book |author=Camuto, C. |year=2000 |title=Another Country: Journeying toward the Cherokee Mountains |publisher=University of Georgia Press |isbn=978-0-8203-2237-7}}</ref> Traditionally, Cherokee people generally avoid killing red wolves, as such an act is believed to bring about the vengeance of the killed animals' pack-mates.<ref>{{cite book |author=Lopez, B.H. |year=1978 |title=Of Wolves and Men |publisher=J.M. Dent and Sons Limited |page=109 |isbn=978-0-7432-4936-2}}</ref>

== Gallery ==
<gallery mode="packed">
07-03-23RedWolfAlbanyGAChehaw.jpg|Showing color variation
Red Wolf Portrait - 6189163039.jpg|In winter
Red_Wolf.jpg|Color contrast
Adult Red Wolf.jpg|A red wolf in a breeding program. Fewer than 100 remain in the wild.
Red wolf with radio collar.jpg|With radio collar
The Wolves of North America (1944) Oklahoma Red Wolf.png|A captive red wolf from Oklahoma (1944)
</gallery>

== Taxonomy ==
[[File:Canis rufus & Canis latrans.jpg|thumb|right|350px|Comparative image of a red wolf and a western coyote (''[[Coyote#Subspecies|C.&nbsp;latrans incolatus]]'')]]

The taxonomic status of the red wolf is debated. It has been described as either a species with a distinct lineage,<ref name="nowak2003" /> a recent hybrid of the gray wolf and the coyote,<ref name="wozencraft2005" /> an ancient hybrid of the gray wolf and the coyote which warrants species status,<ref name="hohenlohe2017" /> or a distinct species that has undergone recent hybridization with the coyote.<ref name="schmitt2014" /><ref name="fredrickson2006" />

The naturalists [[John James Audubon]] and [[John Bachman]] were the first to suggest that the wolves of the southern United States were different from wolves in its other regions. In 1851, they recorded the "Black American Wolf" as ''C.&nbsp;l.'' var. ''ater'' that existed in Florida, South Carolina, North Carolina, Kentucky, southern Indiana, southern Missouri, Louisiana, and northern Texas. They also recorded the "Red Texan Wolf" as ''C.&nbsp;l.'' var. ''rufus'' that existed from northern Arkansas, through Texas, and into Mexico. In 1912, the zoologist [[Gerrit Smith Miller Jr.]] noted that the designation ''ater'' was unavailable and recorded these wolves as ''C.&nbsp;l.&nbsp;floridanus''.<ref name=nowak1979/>

In 1937, the zoologist [[Edward Alphonso Goldman]] proposed a new species of wolf ''Canis rufus''.<ref name=goldman1937/> Three [[subspecies]] of red wolf were originally recognized by Goldman, with two of these subspecies now being extinct. The [[Florida black wolf]] (''Canis rufus floridanus'') (Maine to Florida) has been extinct since 1908 and the Texas red wolf (''Canis rufus rufus'') (south-central United States)<ref name="nowak2002" /> was declared extinct by 1970. By the 1970s, the [[Gregory's wolf|Mississippi Valley red wolf]] (''Canis rufus gregoryi'') existed only in the coastal prairies and marshes of extreme southeastern Texas and southwestern Louisiana. These were removed from the wild to form a captive breeding program and reintroduced into eastern North Carolina in 1987.<ref name=McCarley1979/><ref>{{Cite book |last=Day |first=David |url=https://archive.org/details/vanishedspecies0000dayd/page/162/mode/2up?view=theater |title=The Encyclopedia of Vanished Species |publisher=Gallery Books |year=1989 |location=Manhattan, New York, United States |pages=162–164 |isbn=978-0-8317-2782-6 |language=en}}</ref><ref>{{Cite book |last1=Trani |first1=Margaret |url=https://www.nrs.fs.usda.gov/pubs/jrnl/2007/nrs_2007_trani_003.pdf |title=The land manager's guide to mammals of the South |last2=Chapman |first2=Brian |publisher=[[The Nature Conservancy]] |year=2007 |location=Durham, NC |page=441 |language=en}}</ref>

In 1967, the zoologists [[Barbara Lawrence (zoologist)|Barbara Lawrence]] and William H. Bossert believed that the case for classifying ''C.&nbsp;rufus'' as a species was based too heavily on the small red wolves of central Texas, from where it was known that there existed hybridization with the coyote. They said that if an adequate number of specimens had been included from Florida, then the separation of ''C.&nbsp;rufus'' from ''C.&nbsp;lupus'' would have been unlikely.<ref name=nowak1979/> The taxonomic reference ''[[Catalogue of Life]]'' classifies the red wolf as a [[Subspecies of Canis lupus|subspecies of ''Canis lupus'']].<ref name=COL2018r/> The mammalogist W.&nbsp;Christopher Wozencraft, writing in ''[[Mammal Species of the World]]'' (2005), regards the red wolf as a hybrid of the gray wolf and the coyote, but due to its uncertain status compromised by recognizing it as a subspecies of the gray wolf ''Canis lupus rufus''.<ref name=wozencraft2005/>

In 2021, the [[American Society of Mammalogists]] considered the red wolf as its own species (''Canis rufus'').<ref>{{cite web |title=''Canis rufus'' Audubon & Bachman, 1851 |work=ASM Mammal Diversity Database: Explore the Database |url=https://www.mammaldiversity.org/explore.html#genus=Canis&species=rufus&id=1005945 |access-date=2023-05-25 |archive-date=2020-10-28  |archive-url=https://web.archive.org/web/20201028140029/https://www.mammaldiversity.org/explore.html#genus=Canis&species=rufus&id=1005945 }}</ref><ref name=vonholdt2016/>

=== Taxonomic debate ===
When European settlers first arrived to North America, the coyote's range was limited to the western half of the continent. They existed in the arid areas and across the open plains, including the prairie regions of the midwestern states. Early explorers found some in Indiana and Wisconsin. From the mid-1800s onward, coyotes began expanding beyond their original range.<ref name=nowak1979/>

The taxonomic debate regarding North American wolves can be summarised as follows:
{{Blockquote|There are two prevailing evolutionary models for North American ''Canis'':
;(i) a two-species model: that identifies '''grey wolves''' (''C.&nbsp;lupus'') and (western) '''coyotes''' (''Canis latrans'') as distinct species that gave rise to various hybrids, including the Great Lakes-boreal wolf (also known as Great Lakes wolf), the eastern coyote (also known as Coywolf / brush wolf / tweed wolf), the red wolf, and the eastern (Algonquin) wolf;
and
;(ii) a three-species model: that identifies the '''grey wolf''', western '''coyote''', and '''eastern wolf''' (''C.&nbsp;lycaon'') as distinct species, where Great Lakes-boreal wolves are the product of grey wolf × eastern wolf hybridization, eastern coyotes are the result of eastern wolf × western coyote hybridization, and red wolves are considered historically the same species as the eastern wolf, although their contemporary genetic signature has diverged owing to a bottleneck associated with captive breeding.<ref name=rutledge2015/>
}}

==== Fossil evidence ====
The [[paleontologist]] Ronald M. Nowak notes that the oldest fossil remains of the red wolf are 10,000&nbsp;years old and were found in Florida near [[Melbourne, Florida|Melbourne]], [[Brevard County, Florida|Brevard County]], Withlacoochee River, [[Citrus County, Florida|Citrus County]], and [[Devil's Den Cave]], [[Levy County, Florida|Levy County]]. He notes that there are only a few, but questionable, fossil remains of the gray wolf found in the southeastern states. He proposes that following the extinction of the [[dire wolf]], the coyote appears to have been displaced from the southeastern US by the red wolf until the last century, when the extirpation of wolves allowed the coyote to expand its range. He also proposes that the ancestor of all North American and Eurasian wolves was ''[[Canis variabilis#Canis mosbachensis|C.&nbsp;mosbachensis]]'', which lived in the [[Middle Pleistocene]] 700,000–300,000&nbsp;years ago.<ref name=nowak2002/>

''C.&nbsp;mosbachensis'' was a wolf that once lived across Eurasia before going extinct. It was smaller than most North American wolf populations and smaller than ''C.&nbsp;rufus'', and has been described as being similar in size to the small [[Indian wolf]], ''Canis lupus pallipes''. He further proposes that ''C.&nbsp;mosbachensis'' invaded North America where it became isolated by the later glaciation and there gave rise to ''C.&nbsp;rufus''. In Eurasia, ''C.&nbsp;mosbachensis'' evolved into ''C.&nbsp;lupus'', which later invaded North America.<ref name=nowak2003/>{{rp|242}}

The [[paleontologist]] and expert on the genus ''Canis''{{'}} natural history, [[Xiaoming Wang (paleontologist)|Xiaoming Wang]], looked at red wolf fossil material but could not state if it was, or was not, a separate species. He said that Nowak had put together more [[morphometric]] data on red wolves than anybody else, but Nowak's statistical analysis of the data revealed a red wolf that is difficult to deal with. Wang proposes that studies of [[ancient DNA]] taken from fossils might help settle the debate.<ref name=beeland2013/> In 2009, Tedford, Wang and Taylor reclassified the purported red wolf fossils as ''[[Canis armbrusteri]]'' and ''[[Canis edwardii]]''.<ref>{{cite journal |title=Phylogenetic systematics of the North American fossil Caninae (Carnivora: Canidae) |year=2009 |first1=Richard |last1=Tedford |author1-link=Richard H. Tedford |first2=Xiaoming |last2=Wang |author2-link=Xiaoming Wang (paleontologist) |first3=Beryl E. |last3=Taylor |journal=[[Bulletin of the American Museum of Natural History]] |volume=325 |pages=1–218 |doi=10.1206/574.1 |hdl=2246/5999 |s2cid=83594819 |url=https://bioone.org/journals/bulletin-of-the-american-museum-of-natural-history/volume-2009/issue-325/574.1/Phylogenetic-Systematics-of-the-North-American-Fossil-Caninae-Carnivora/10.1206/574.1.full|url-access=subscription }}</ref>

==== Morphological evidence ====
[[File:John Woodhouse Audubon - Red Texas Wolf (Canis Lupus) - Google Art Project.jpg|thumb|Audubon's depiction of the red wolf (1851)]]
[[File:The Wolves of North America (1944) C. lupus, rufus & latrans.jpg|thumb|Skulls of North American canines, with the red wolf in the center]]

In 1771, the English naturalist [[Mark Catesby]] referred to Florida and the Carolinas when he wrote that "The Wolves in America are like those of Europe, in shape and colour, but are somewhat smaller." They were described as being more timid and less voracious.<ref name=catesby1771/> In 1791, the American naturalist [[William Bartram]] wrote in his book ''[[Bartram's Travels|Travels]]'' about a wolf which he had encountered in Florida that was larger than a dog, but was black in contrast to the larger yellow-brown wolves of Pennsylvania and Canada.<ref name=phillips2003/><ref name=bartram1791/> In 1851, the naturalists [[John James Audubon]] and [[John Bachman]] described the "Red Texan Wolf" in detail. They noted that it could be found in Florida and other southeastern states, but it differed from other North American wolves and named it ''Canis lupus rufus''. It was described as being more fox-like than the gray wolf, but retaining the same "sneaking, cowardly, yet ferocious disposition".<ref name=audubon1851/>

In 1905, the mammalogist [[Vernon Orlando Bailey|Vernon Bailey]] referred to the "Texan Red Wolf" with the first use of the name ''Canis rufus''.<ref name=bailey1905/> In 1937, the zoologist [[Edward Alphonso Goldman|Edward Goldman]] undertook a [[Morphology (biology)|morphological]] study of southeastern wolf specimens. He noted that their skulls and dentition differed from those of gray wolves and closely approached those of coyotes. He identified the specimens as all belonging to the one species which he referred to as ''Canis rufus''.<ref name=goldman1937/><ref name=goldman1944/> Goldman then examined a large number of southeastern wolf specimens and identified three subspecies, noting that their colors ranged from black, gray, and cinnamon-buff.<ref name=goldman1944/>

It is difficult to distinguish the red wolf from a red wolf × coyote hybrid.<ref name=phillips2003/> During the 1960s, two studies of the skull morphology of wild ''Canis'' in the southeastern states found them to belong to the red wolf, the coyote, or many variations in between. The conclusion was that there has been recent massive hybridization with the coyote.<ref name=mccarley1962/><ref name=paradiso1968/> In contrast, another 1960s study of ''Canis'' morphology concluded that the red wolf, eastern wolf, and domestic dog were closer to the gray wolf than the coyote, while still remaining clearly distinctive from each other. The study regarded these 3&nbsp;canines as subspecies of the gray wolf. However, the study noted that "red wolf" specimens taken from the edge of their range which they shared with the coyote could not be attributed to any one species because the cranial variation was very wide. The study proposed further research to ascertain if hybridization had occurred.<ref name=lawrence1967/><ref name=lawrence1975/>

In 1971, a study of the skulls of ''C.&nbsp;rufus'', ''C.&nbsp;lupus'' and ''C.&nbsp;latrans'' indicated that ''C.&nbsp;rufus'' was distinguishable by being in size and shape midway between the gray wolf and the coyote. A re-examination of museum canine skulls collected from central Texas between 1915 and 1918 showed variations spanning from ''C.&nbsp;rufus'' through to ''C.&nbsp;latrans''. The study proposes that by 1930 due to human habitat modification, the red wolf had disappeared from this region and had been replaced by a [[hybrid swarm]]. By 1969, this hybrid swarm was moving eastwards into eastern Texas and Louisiana.<ref name=paradiso1971/>

In the late 19th century, sheep farmers in [[Kerr County, Texas]], stated that the coyotes in the region were larger than normal coyotes, and they believed that they were a gray wolf and coyote cross.<ref name=nowak1979/> In 1970, the wolf mammalogist [[L. David Mech]] proposed that the red wolf was a hybrid of the gray wolf and coyote.<ref name=mech1970/> However, a 1971 study compared the [[cerebellum]] within the brain of six ''Canis'' species and found that the cerebellum of the red wolf indicated a distinct species, was closest to that of the gray wolf, but in contrast indicated some characteristics that were more primitive than those found in any of the other ''Canis'' species.<ref name=atkins1971/> In 2014, a three-dimensional [[Morphometrics#Landmark-based geometric morphometrics|morphometrics]] study of ''Canis'' species accepted only six red wolf specimens for analysis from those on offer, due to the impact of hybridization on the others.<ref name=schmitt2014/>

==== DNA studies ====
Different DNA studies may give conflicting results because of the specimens selected, the technology used, and the assumptions made by the researchers.<ref name=boyko2009/>{{efn| Any one from a panel of [[genetic marker]]s can be chosen for use in a study. The techniques used to [[DNA extraction|extract]], [[DNA sequencing|locate]] and [[DNA analysis|compare]] genetic sequences can be applied using advances in technology, which allows researchers to observe longer lengths of [[Base pair#Length measurements|base pairs]] that provide more data to give better [[phylogenetic]] resolution.<ref name=pang2009/>}}

[[Phylogenetic trees]] compiled using different [[genetic markers]] have given conflicting results on the relationship between the wolf, dog and coyote. One study based on [[Single-nucleotide polymorphism|SNPs]]<ref name=cronin2014/> (a single [[mutation]]), and another based on [[nuclear gene]] sequences<ref name=bardeleben2005/> (taken from the [[cell nucleus]]), showed dogs clustering with coyotes and separate from wolves. Another study based on SNPS showed wolves clustering with coyotes and separate from dogs.<ref name=gray2010/> Other studies based on a number of markers show the more widely accepted result of wolves clustering with dogs separate from coyotes.<ref name=vila1997/><ref name=wayne2012/> These results demonstrate that caution is needed when interpreting the results provided by genetic markers.<ref name=cronin2014/>

===== Genetic marker evidence =====
In 1980, a study used [[gel electrophoresis]] to look at fragments of DNA taken from dogs, coyotes, and wolves from the red wolf's core range. The study found that a unique [[allele]] (expression of a [[gene]]) associated with [[Lactate dehydrogenase]] could be found in red wolves, but not dogs and coyotes. The study suggests that this allele survives in the red wolf. The study did not compare gray wolves for the existence of this allele.<ref name=ferrell1980/>

[[Mitochondrial DNA]] (mDNA) passes along the maternal line and can date back thousands of years.<ref name=beeland2013/> In 1991, a study of red wolf mDNA indicates that red wolf [[genotypes]] match those known to belong to the gray wolf or the coyote. The study concluded that the red wolf is either a wolf × coyote hybrid or a species that has hybridized with the wolf and coyote across its entire range. The study proposed that the red wolf is a southeastern occurring subspecies of the gray wolf that has undergone hybridization due to an expanding coyote population; however, being unique and threatened that it should remain protected.<ref name=wayne1991/> This conclusion led to debate for the remainder of the decade.<ref name=gittleman1991/><ref name=nowak1992/><ref name=dowling1992/><ref name=roy1994/><ref name=brewster1995/><ref name=nowak1995/><ref name=nowak1995a/><ref name=roy1996/><ref name=nowak1998/><ref name=wayne1998/><ref name=reich1999/>

{{cladogram
|title=Proposed phylogenetic tree of wolf evolution
|cladogram=
  {{clade
  |label1 = Ancestral Canid{{br}}(1-2 million years ago)
  |1 =
    {{clade
    |1 =
      {{clade
      |1 = [[Coyote]]
      |2 =
        {{clade
        |1 = Red wolf
        |2 = [[Eastern wolf]]
        }}
      }}
    |label2 = [[Gray wolf]]
    |grouplabel2 = [[Subspecies of Canis lupus|Gray wolf subspecies]]
    |bar2 = grey
    |2 =
      {{clade
      |1 = {{clade}}
      |2 = {{clade}}
      }}
    }}
  }}
}}

In 2000, a study looked at red wolves and [[Eastern wolf|eastern Canadian wolves]]. The study agreed that these two wolves readily hybridize with the coyote. The study used eight [[microsatellites]] (genetic markers taken from across the [[genome]] of a specimen). The phylogenetic tree produced from the genetic sequences showed red wolves and eastern Canadian wolves clustering together. These then clustered next closer with the coyote and away from the gray wolf. A further analysis using mDNA sequences indicated the presence of coyote in both of these two wolves, and that these two wolves had diverged from the coyote 150,000–300,000&nbsp;years ago. No gray wolf sequences were detected in the samples. The study proposes that these findings are inconsistent with the two wolves being subspecies of the gray wolf, that red wolves and eastern Canadian wolves evolved in North America after having diverged from the coyote, and therefore they are more likely to hybridize with coyotes.<ref name=wilson2000/>

In 2009, a study of eastern Canadian wolves using microsatellites, mDNA, and the paternally-inherited [[yDNA]] markers found that the eastern Canadian wolf was a unique [[ecotype]] of the gray wolf that had undergone recent hybridization with other gray wolves and coyotes. It could find no evidence to support the findings of the earlier 2000 study regarding the eastern Canadian wolf. The study did not include the red wolf.<ref name=koblmuller2009/>

In 2011, a study compared the genetic sequences of 48,000&nbsp;[[single nucleotide polymorphisms]] ([[mutations]]) taken from the genomes of canids from around the world. The comparison indicated that the red wolf was about 76% coyote and 24% gray wolf with hybridization having occurred 287–430&nbsp;years ago. The eastern wolf was 58% gray wolf and 42% coyote with hybridization having occurred 546–963&nbsp;years ago. The study rejected the theory of a common ancestry for the red and eastern wolves.<ref name=beeland2013/><ref name=vonholdt2011/> However the next year, a study reviewed a subset of the 2011 study's [[Single-nucleotide polymorphism]] (SNP) data and proposed that its methodology had skewed the results and that the red and eastern wolves are not hybrids but are in fact the same species separate from the gray wolf.<ref name=beeland2013/><ref name=rutledge2012a>{{cite journal |last1=Rutledge |first1=Linda Y. |last2=Wilson |first2=Paul J. |last3=Klütsch |first3=Cornelya F.C. |last4=Patterson |first4=Brent R. |last5=White |first5=Bradley N. |year=2012 |url=http://people.trentu.ca/brentpatterson/index_files/Rutledge%20et%20al%202012%20-%20conservation%20genomics%20in%20perspective.pdf |title=Conservation genomics in perspective: A holistic approach to understanding ''Canis'' evolution in North America |journal=Biological Conservation |volume=155 |pages=186–192 |doi=10.1016/j.biocon.2012.05.017 |bibcode=2012BCons.155..186R |access-date=2013-07-01}}</ref> The 2012 study proposed that there are three true ''Canis'' species in North America: The gray wolf, the western coyote, and the red wolf / eastern wolf. The eastern wolf was represented by the Algonquin wolf. The Great Lakes wolf was found to be a hybrid of the eastern wolf and the gray wolf. Finally, the study found the eastern coyote itself to be yet another a hybrid between the western coyote and the eastern (Algonquin) wolf (for more on eastern North American wolf-coyote hybrids, ''see'' [[coywolf]]).<ref name=rutledge2012a/>

Also in 2011, a scientific [[literature review]] was undertaken to help assess the taxonomy of North American wolves. One of the findings proposed was that the eastern wolf is supported as a separate species by morphological and genetic data. Genetic data supports a close relationship between the eastern and red wolves, but not close enough to support these as one species. It was "likely" that these were the separate descendants of a common ancestor shared with coyotes. This review was published in 2012.<ref name=chambers2012/> In 2014, the [[National Center for Ecological Analysis and Synthesis]] was invited by the [[United States Fish and Wildlife Service]] to provide an independent review of its proposed rule relating to gray wolves. The center's panel findings were that the proposed rule depended heavily upon a single analysis contained in a scientific literature review by Chambers ''et al''. (2011 ),{{citation needed|date=November 2023}} that that study was not universally accepted, that the issue was "not settled", and that the rule does not represent the "best available science".<ref name=dumbacher2014/>

Brzeski ''et al''. (2016)<ref name=brzeski2016/> conducted an mDNA analysis of three ancient (300–1,900&nbsp;years old) wolf-like samples from the southeastern United States found that they grouped with the coyote clade, although their teeth were wolf-like. The study proposed that the specimens were either coyotes and this would mean that coyotes had occupied this region continuously rather than intermittently, a North American evolved red wolf lineage related to coyotes, or an ancient coyote–wolf hybrid. Ancient hybridization between wolves and coyotes would likely have been due to natural events or early human activities, not landscape changes associated with European colonization because of the age of these samples.<ref name=brzeski2016/> Coyote–wolf hybrids may have occupied the southeastern United States for a long time, filling an important niche as a medium-large predator.<ref name=roy1996/><ref name=brzeski2016/>

===== Whole-genome evidence =====
[[File:Red Wolf (1980).png|right|thumb|A red wolf in the forest]]
In July 2016, a [[Whole genome sequencing|whole-genome]] DNA study proposed, based on the assumptions made, that all of the North American wolves and coyotes diverged from a common ancestor less than 6,000–117,000&nbsp;years ago. The study also indicated that all North America wolves have a significant amount of coyote ancestry and all coyotes some degree of wolf ancestry, and that the red wolf and Great Lakes region wolf are highly [[Genetic admixture|admixed]] with different proportions of gray wolf and coyote ancestry. One test indicated a wolf/coyote divergence time of 51,000&nbsp;years before present that matched other studies indicating that the extant wolf came into being around this time. Another test indicated that the red wolf diverged from the coyote between 55,000 and 117,000&nbsp;years before present and the Great Lakes region wolf 32,000&nbsp;years before present. Other tests and modelling showed various divergence ranges and the conclusion was a range of less than 6,000 and 117,000&nbsp;years before present. The study found that coyote ancestry was highest in red wolves from the southeast of the United States and lowest among the Great Lakes region wolves.

The theory proposed was that this pattern matched the south-to-north disappearance of the wolf due to European colonization and its resulting loss of habitat. Bounties led to the extirpation of wolves initially in the southeast, and as the wolf population declined wolf-coyote admixture increased. Later, this process occurred in the Great Lakes region with the influx of coyotes replacing wolves, followed by the expansion of coyotes and their hybrids across the wider region.<ref name=vonholdt2016/><ref>{{cite journal |doi=10.1126/science.aag0699 |title=How do you save a wolf that's not really a wolf? |journal=Science |year=2016 |last1=Morell |first1=Virginia}}</ref> The red wolf may possess some genomic elements that were unique to gray wolf and coyote lineages from the American South.<ref name=vonholdt2016/> The proposed timing of the wolf/coyote divergence conflicts with the finding of a coyote-like specimen in strata dated to 1 million years before present,<ref name=wang2008/> and red wolf fossil specimens dating back 10,000&nbsp;years ago.<ref name=nowak2002/> The study concluded by stating that because of the extirpation of gray wolves in the American Southeast, "the reintroduced population of red wolves in eastern North Carolina is doomed to genetic swamping by coyotes without the extensive management of hybrids, as is currently practiced by the USFWS."<ref name=vonholdt2016/>

In September&nbsp;2016, the USFWS announced a program of changes to the red wolf recovery program<ref name=fws2016a/> and "will begin implementing a series of actions based on the best and latest scientific information". The service will secure the captive population which is regarded as not sustainable, determine new sites for additional experimental wild populations, revise the application of the existing experimental population rule in North Carolina, and complete a comprehensive Species Status Assessment.<ref name=fws2016b/>

In 2017, a group of canid researchers challenged the recent finding that the red wolf and the eastern wolf were the result of recent coyote-wolf hybridization. The group highlight that no testing had been undertaken to ascertain the time period that hybridization had occurred and that, by the previous study's own figures, the hybridization could not have occurred recently but supports a much more ancient hybridization. The group found deficiencies in the previous study's selection of specimens and the findings drawn from the different techniques used. Therefore, the group argues that both the red wolf and the eastern wolf remain genetically distinct North American taxa.<ref name=hohenlohe2017/> This was rebutted by the authors of the earlier study.<ref name=vonholdt2017/> Another study in late 2018 of wild canids in southwestern [[Louisiana]] also supported the red wolf as a separate species, citing distinct red wolf DNA within hybrid canids.<ref name=":4">{{Cite journal |last1=Murphy |first1=Sean M. |last2=Adams |first2=Jennifer R. |last3=Cox |first3=John J. |last4=Waits |first4=Lisette P. |title=Substantial red wolf genetic ancestry persists in wild canids of southwestern Louisiana |journal=Conservation Letters |language=en |issue=2 |article-number=e12621 |doi=10.1111/conl.12621 |issn=1755-263X |year=2018|volume=12 |doi-access=free }}</ref>

In 2019, a [[literature review]] of the previous studies was undertaken by the [[National Academies of Sciences, Engineering, and Medicine]]. The position of the National Academies is that the historical red wolf forms a valid taxonomic species, the modern red wolf is distinct from wolves and coyotes, and modern red wolves trace some of their ancestry to historic red wolves. The species ''Canis rufus'' is supported for the modern red wolf, unless genomic evidence from historical red wolf specimens changes this assessment, due to a lack of continuity between the historic and the modern red wolves.<ref>{{cite book |doi=10.17226/25351 |pmid=31211533 |title=Evaluating the Taxonomic Status of the Mexican Gray Wolf and the Red Wolf |year=2019 |isbn=978-0-309-48824-2 |department=Board on Life Sciences |publisher=National Academies of Sciences and Engineering|last1=National Academies Of Sciences |first1=Engineering |bibcode=2019nap..book25351N |s2cid=134662152 }}</ref>

===== Wolf genome =====
Genetic studies relating to wolves or dogs have inferred phylogenetic relationships based on the only reference genome available, that of the [[Boxer (dog)|Boxer dog]]. In 2017, the first reference genome of the wolf ''Canis lupus lupus'' was mapped to aid future research.<ref name=gopalakrishnan2017/> In 2018, a study looked at the genomic structure and admixture of North American wolves, wolf-like canids, and coyotes using specimens from across their entire range that mapped the largest dataset of nuclear genome sequences against the wolf reference genome. The study supports the findings of previous studies that North American gray wolves and wolf-like canids were the result of complex gray wolf and coyote mixing. A [[Greenland wolf|polar wolf from Greenland]] and a coyote from Mexico represented the purest specimens. The coyotes from Alaska, California, Alabama, and Quebec show almost no wolf ancestry. Coyotes from Missouri, Illinois, and Florida exhibit 5–10% wolf ancestry. There was 40%:60% wolf to coyote ancestry in red wolves, 60%:40% in Eastern timber wolves, and 75%:25% in the Great Lakes wolves. There was 10% coyote ancestry in Mexican wolves and Atlantic Coast wolves, 5% in Pacific Coast and [[History of wolves in Yellowstone|Yellowstone wolves]], and less than 3% in Canadian archipelago wolves.<ref name=sinding2018/>

The study shows that the genomic ancestry of red, eastern timber and Great Lakes wolves were the result of admixture between modern gray wolves and modern coyotes. This was then followed by development into local populations. Individuals within each group showed consistent levels of coyote to wolf inheritance, indicating that this was the result of relatively ancient admixture. The eastern timber wolf ([[Algonquin Provincial Park]]) is genetically closely related to the Great Lakes wolf (Minnesota, Isle Royale National Park). If a third canid had been involved in the admixture of the North American wolf-like canids, then its genetic signature would have been found in coyotes and wolves, which it has not.<ref name=sinding2018/>

Gray wolves suffered a species-wide [[population bottleneck]] (reduction) approximately 25,000 YBP during the Last Glacial Maximum. This was followed by a single population of modern wolves expanding out of a [[Beringia#Refugium|Beringia refuge]] to repopulate the wolf's former range, replacing the remaining [[Megafaunal wolf|Late Pleistocene wolf]] populations across Eurasia and North America as they did so.<ref name=Loog2018/><ref name=Schweizer2020/> This implies that if the coyote and red wolf were derived from this invasion, their histories date only tens of thousands and not hundreds of thousands of years ago, which is consistent with other studies.<ref name=Schweizer2020/>

The Endangered Species Act provides protection to endangered species, but does not provide protection for endangered admixed individuals, even if these serve as reservoirs for extinct genetic variation. Researchers on both sides of the red wolf debate argue that admixed canids warrant full protection under this Act.<ref name=heppenheimer2018/><ref name=vonholdt2016/>

===== Separate species that can be strengthened from hybrids =====
In 2020, a study conducted DNA sequencing of [[Canis|canines]] across southeastern US to detect those with any red wolf ancestry. The study found that red wolf ancestry exists in the coyote populations of southwestern Louisiana and southeastern Texas, but also newly detected in North Carolina. The red wolf ancestry of these populations possess unique red wolf alleles not found in the current captive red wolf population. The study proposes that the expanding coyotes admixed with red wolves to gain genetic material that was suited to the southeastern environment and would aid their adaptation to it, and that surviving red wolves admixed with coyotes because the red wolves were suffering from inbreeding.<ref name=Heppenheimer2020/>

In 2021, a study conducted DNA sequencing of canines across the remnant red wolf hybrid zone of southwestern Louisiana and southeastern Texas. The study found red wolf ancestry in the coyote genomes which increases up to 60% in a westward gradient. This was due to introgression from the remnant red wolf population over the past 100 years. The study proposes that coyotes expanded into the [[Gulf of Mexico|gulf]] region and admixed with red wolves prior to the red wolf going extinct in the wild due to loss of habitat and persecution. In the past two decades the hybrid region has expanded. The study presented the genetic evidence that the red wolf is a separate species, based on the structure of one of the [[Locus (genetics)|loci]] of its [[X-chromosome]] which is accepted as a marker for distinct species. As such, the study suggested that the introgressed red wolf ancestry could be de-introgressed back as a basis for breeding further red wolves from the hybrids.<ref name=Vonholdt2021/>

===== Pre-dates the coyote in North America =====
In 2021, a study of mitochondrial genomes sourced from specimens dated before the 20th century revealed that red wolves could be found across North America. With the arrival of the gray wolf between 80,000 and 60,000 years ago, the red wolf's range shrank to the eastern forests and California, and the coyote replaced the red wolf mid-continent between 60,000 and 30,000 years ago. The coyote expanded into California at the beginning of the [[Holocene]] era 12,000–10,000 years ago and admixed with the red wolf, phenotypically replacing them. The study proposes that the red wolf may pre-date the coyote in North America.<ref name=Sacks2021/>

== Explanatory footnotes ==
{{notelist|1}}

== References ==
{{Reflist|30em|refs=

<ref name=atkins1971>{{cite journal |last1=Atkins |first1=D. |year=1971 |title=Evolution of the cerebellum in the genus ''Canis'' |journal=[[Journal of Mammalogy]] |volume=52 |issue=1 |pages=96–97 |doi=10.2307/1378435 |jstor=1378435 |pmid=5545568}}</ref>

<ref name=audubon1851>{{cite book |author1=Audubon, J. |author2=Bachman J. |year=1851 |title=The Vivaparous Quadrupeds of North America |volume=2 |place=New York, NY |publisher=V.G. Audubon |url=https://archive.org/stream/quadrupedsofnort02audu#page/240/mode/2up/search/rufus |page=240}}</ref>

<ref name=bailey1905>{{cite journal |author=Bailey, V. |year=1905 |title=Biological survey of Texas: Life zones, with characteristic species of mammals, birds, reptiles, and plants |quote=Reptiles, with notes of distribution. Mammals, with notes on distribution, habits and economic importance. |journal=North American Fauna |volume=25 |page=174 |doi=10.3996/nafa.25.0001 |doi-access=free |url=https://www.biodiversitylibrary.org/item/164094#page/208/mode/1up}}</ref>

<ref name=bardeleben2005>{{cite journal |doi=10.1016/j.ympev.2005.07.019 |pmid=16213754 |title=A molecular phylogeny of the Canidae based on six nuclear loci |journal=Molecular Phylogenetics and Evolution |volume=37 |issue=3 |pages=815–831 |year=2005 |last1=Bardeleben |first1=Carolyne |last2=Moore |first2=Rachael L. |last3=Wayne |first3=Robert K. |bibcode=2005MolPE..37..815B}}</ref>

<ref name=bartram1791>{{cite book |author=Bartram, W. |orig-date=1791 |year=1794 |title=Travels through North and South Carolina, Georgia, East and West Florida, the Cherokee Country, the Extensive Territories of the Muscogulges or Creek Confederacy, and the Country of the Chactaws |quote=Containing an Account of the Soil and Natural Productions of Those Regions; Together with Observations on the Manners of the Indians. |publisher=James & Johnson |place=Philadelphia, PA / London, UK |page=197 |edition=2nd |url=https://archive.org/stream/travelsthroughno00bart#page/196/mode/2up/search/wolf}}</ref>

<ref name=beeland2013>{{cite book |last1=Beeland |first1=T. |title=The Secret World of Red Wolves: The fight to save North America's other wolf |publisher=[[University of North Carolina Press]] |year=2013 |chapter=Chapter&nbsp;8 - Tracing the Origins of Red Wolves |pages=105–123 |isbn=978-1-4696-0199-1 |chapter-url={{Google books|plainurl=yes |id=YyEUCAAAQBAJ|page=119}} }}</ref>

<ref name=boyko2009>{{cite journal |author=Boyko, A. |year=2009 |title=Complex population structure in African village dogs and its implications for inferring dog domestication history |journal=[[Proceedings of the National Academy of Sciences]] |volume=106 |issue=33 |pages=13903–13908 |doi=10.1073/pnas.0902129106 |pmid=19666600 |pmc=2728993 |bibcode=2009PNAS..10613903B |doi-access=free}}</ref>

<ref name=brewster1995>{{cite book |author1=Brewster, W.G. |author2=Fritts, S.H. |year=1995 |contribution=Taxonomy and genetics of the gray wolves in western North America |title=Ecology and Conservation of Wolves in a Changing World |series=Proceedings of the Second North American Symposium on wolves |editor1=Carbyn, L.N. |editor2=Fritts, S.H. |editor3=Seip, D.R. |department=Canadian Circumpolar Institute |publisher=[[University of Alberta]] |place=Edmonton, AB |pages=353–373}}</ref>

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}}

== Further reading ==
* {{cite web |url=https://www.fws.gov/southeast/pdf/five-year-reviews/red-wolf-2018.pdf |publisher=USFWS |title=Red Wolf 5-year review |year=2018 |access-date=2018-06-26 |archive-date=2018-06-26 |archive-url=https://web.archive.org/web/20180626163757/https://www.fws.gov/southeast/pdf/five-year-reviews/red-wolf-2018.pdf }}
* {{cite journal |author=Nowak, R.M. |year=1992 |title=The red wolf is not a hybrid |journal=Conservation Biology |volume=6 |issue=4 |pages=593–595|doi=10.1046/j.1523-1739.1992.06040593.x |bibcode=1992ConBi...6..593N |url=https://zenodo.org/record/1236494 }}
* {{cite journal |author1=Hinton, J.W. |author2=Chamberlain, M.J. |author3=Rabon, D.R. |year=2013 |title=Red Wolf (''Canis rufus'') Recovery: A Review with Suggestions for Future Research |volume=3 |issue=3 |pages=722–744 |doi=10.3390/ani3030722 |pmid=26479530 |pmc=4494459 |journal=Animals|doi-access=free }}
* {{cite journal |author1=Roy, M.S. |author2=Geffen, E. |author3=Smith, D. |author4=Ostrander, E.A. |author5=Wayne, R.K. |year=1994 |title=Patterns of differentiation and hybridization in North American wolflike canids, revealed by analysis of micro satellite loci. |journal=Molecular Biology and Evolution |volume=11 |issue=4 |pages=553–570|doi=10.1093/oxfordjournals.molbev.a040137 |pmid=8078397 |doi-access=free }}
* {{cite journal |author1=Roy, M.S. |author2=Girman, D.G. |author3=Taylor, A.C. |author4=Wayne, R.K. |year=1994 |title=The use of museum specimens to reconstruct the genetic variability and relationships of extinct populations |journal=Experientia |volume=50 |issue=6 |pages=551–557|doi=10.1007/BF01921724 |pmid=8020615 |s2cid=38843030 }}
* {{cite book |author1=Silverstein, A. |author2=Silverstein, V.B. |author3=Silverstein, R.A. |year=1994 |title=The Red Wolf: Endangered in America |url=https://archive.org/details/redwolfsilv00silv |url-access=registration |place=Brookfield, CT |publisher=Millbrook Press|isbn=978-1-56294-416-2 }}

== External links ==
{{Wikispecies|Canis rufus}}

{{Commons and category|Canis rufus|Canis rufus}}

* [https://www.fws.gov/species/red-wolf-canis-rufus Red wolf], U.S. Fish and Wildlife Service
* {{cite web |archive-url=https://web.archive.org/web/20060211121322/http://www.arkive.org/species/GES/mammals/Canis_rufus/more_info.html |archive-date=2006-02-11 |url=http://www.arkive.org/species/GES/mammals/Canis_rufus/more_info.html |website=ARKive.org |title=images and movies of the Red wolf (''Canis rufus'')}}
* {{cite web |archive-url=https://web.archive.org/web/20160325000438/http://www.enature.com/fieldguides/detail.asp?allSpecies=y&searchText=red%20wolf&curGroupID=5&lgfromWhere=&curPageNum=1&viewType=default |archive-date=2016-03-25 |url=http://www.enature.com/fieldguides/detail.asp?allSpecies=y&searchText=red%20wolf&curGroupID=5&lgfromWhere=&curPageNum=1&viewType=default |title=Red Wolf Species Overview |website=eNature.com}}
* {{cite web |url=https://wolf.org/wow/united-states/north-carolina/ |title=Red Wolf |website=International Wolf Center |date=3 December 2012}}
* {{cite web |url=http://www.redwolves.com/ |title=The Red Wolf Coalition}}
* {{cite web |url=http://www.wolfsource.org/ |title=Wolf Source}}

{{Carnivora|Ca.}}
{{Canidae extinct nav|W.}}
{{Grey wolf subspecies}}

{{Taxonbar|from1=Q28196316|from2=Q200442}}

[[Category:Mammals described in 1851]]
[[Category:Mammals of the United States]]
[[Category:Canid hybrids]]
[[Category:Controversial mammal taxa]]
[[Category:Wolves]]
[[Category:Wolves in the United States]]
[[Category:Taxa named by John James Audubon]]
[[Category:Taxa named by John Bachman]]
[[Category:Critically endangered fauna of the United States]]
[[Category:Endemic mammals of the United States]]
[[Category:Fauna of the Southeastern United States]]