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 Falconiformes Sharpe, 1874
                   1 Family Falconidae Vigors, 1824 - falcons, caracaras
                   2 Family Sagittariidae Finsch & Hartlaub, 1870 - secretarybird
                   3 Family Accipitridae Vieillot, 1816 - secretary bird, osprey, kites, hawks and eagles
                   4 Family Pandionidae Sclater & Salvin, 1873 - ospreys