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 Apodiformes Peters, 1940 - swifts
                     Suborder Apodi Peters, 1940
                       Family Apodidae Hartert, 1897 - swifts
                         1 Genus Cypseloides Streubel, 1848
                         2 Genus Collocalia G.R. Gray, 1840
                         3 Genus Chaetura Stephens, 1826
                         4 Genus Apus Scopoli, 1777 - house swift