living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
                   Order Caprimulgiformes Ridgway, 1881 - nightjars
                     1 Suborder Steatornithes Sharpe - oil-birds see Parvorder Steatornithida
                     2 Suborder Caprimulgi Ridgway, 1881 - goatsuckers
                     3 Family Steatornithidae Gray, 1846 - oilbird
                     4 Family Podargidae Gray, 1840 - frogmouths
                     5 Family Nyctibiidae Chenu & Des Murs, 1851 - potoos
                     6 Family Aegothelidae Bonaparte, 1853 - owlet-nightjars
                     7 Family Caprimulgidae Vigors, 1825 - nightjars