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 Strigiformes Wagler, 1830 - owls
                   1 Family †Ogygoptyngidae Rich & Bohaska, 1981
                   2 Family †Protostrigidae Wetmore
                   3 Family Strigidae Vigors, 1825 - owls
                   4 Family Tytonidae Mathews, 1912 - barn owls