Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Struthioniformes Latham, 1790
                   1 Suborder Rheae Forbes, 1884
                   2 Suborder Struthiones see Suborder Struthioni
                   3 Suborder †Aepyornithes
                   4 Suborder Casuarii see Order Casuariiformes Sclater, 1880
                   5 Suborder Apteryges see Order Apterygiformes Haeckel, 1866