It includes the living orders Caprimulgidae ( nightjars, nighthawks and allies ), Nyctibiidae ( potoos ), Apodiformes ( swifts and hummingbirds ), as well as the Aegotheliformes ( owlet-nightjars ) whose distinctness was only recently realized.
2.
These Paleogene birds strongly suggest that the two main extant lineages of cypselomorphs separated about 60-55 mya ( Selandian-Thanetian ), and that some time around the Lutetian-Bartonian boundary, some 40 mya, the common ancestors of Nyctibiidae, Caprimulgidae and eared nightjars diverged from those of oilbird and frogmouths.
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