Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     1 Subclass †Archaeornithes Gadow, 1893 see Superorder Archaeornithes Gadow, 1893
     2 Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893