STRISORES \-+--Caprimulgiformes | \--Caprimulgidae (Nighthawks, Nightjars) \-+--+--Steatornithiformes | | \--Steatornithidae (Oilbird) | \--Nyctibiiformes | \--Nyctibiidae (Potoos) | \-+--Podargiformes | \--Podargidae (Frogmouths) | \-Apodiformes \-+--Aegothelidae (Owlet-nightjars) \-+--+--Hemiprocnidae (Treeswifts) | \--Apodidae (Swifts) \--Trochilidae (Hummingbirds)