living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
Status: extant
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
  Status: extant
     Kingdom Animalia Linnaeus, 1758 - animals
    Status: extant
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
      Status: extant
         Phylum Chordata Bateson, 1885 - chordates
        Status: extant
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
          Status: extant
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
            Status: extant
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
              Status: extant
                 1 Superorder †Odontognathae Wetmore, 1930 see Subclass Archaeornithes Gadow, 1893
                Status: fossil
                 2 Superorder Impennes see Superorder Passerimorphae Sibley et al., 1988
                Status: extant
                 3 Superorder Palaeognathae Pycraft, 1900 see Cohort Palaeognathae Pycraft, 1900
                Status: extant
                 4 Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
                Status: extant