Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           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 Ciconiiformes Bonaparte, 1854
                   1 Family Ciconiidae Sundevall, 1836 - storks
                   2 Family Scopidae Bonaparte, 1853 - hammerkop
                   3 Family Balaenicipitidae Bonaparte - shoebill
                   4 Family †Teratornithidae
                   5 Family Vulturidae Illiger, 1811 - American vultures see Family Cathartidae Lafresnaye, 1839