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=== Caprimulgiformes ===
Previously, all members of the orders [[Apodiformes]], [[Owlet-nightjar|Aegotheliformes]], [[Potoo|Nyctibiiformes]], [[Frogmouth|Podargiformes]], and [[Oilbird|Steatornithiformes]] were lumped alongside nightjars in the Caprimulgiformes. In 2021, the [[International Ornithologists' Union|International Ornithological Congress]] redefined the Caprimulgiformes as only applying to nightjars, with potoos, frogmouths, oilbirds, and owlet-nightjars all being reclassified into their own orders.<ref name=ioc>{{cite web| editor1-last=Gill | editor1-first=Frank | editor1-link=Frank Gill (ornithologist) | editor2-last=Donsker | editor2-first=David | editor3-last=Rasmussen | editor3-first=Pamela | editor3-link=Pamela C. Rasmussen | date=February 2025 | title=Frogmouths, Oilbird, potoos, nightjars | work=IOC World Bird List Version 15.1 | url=https://www.worldbirdnames.org/new/bow/nightjars/ | publisher=International Ornithologists' Union | access-date=28 June 2025 }}</ref> See [[Strisores]] for more info about the disputes over the taxonomy of Caprimulgiformes. A phylogenetic analysis found that the extinct family [[Archaeotrogonidae]], known from the [[Eocene]] and [[Oligocene]] of Europe, are the closest known relatives of nightjars.<ref name=":0">{{Cite journal|last=Mayr|first=Gerald|date=2021-07-18|editor-last=Lautenschlager|editor-first=Stephan|title=An early Eocene fossil from the British London Clay elucidates the evolutionary history of the enigmatic Archaeotrogonidae (Aves, Strisores)|journal=Papers in Palaeontology|volume=7|issue=4|language=en|pages=2049–2064|doi=10.1002/spp2.1392|bibcode=2021PPal....7.2049M |issn=2056-2799|doi-access=free}}</ref>