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 Falconiformes Sharpe, 1874
                   Family Accipitridae Vieillot, 1816 - secretary bird, osprey, kites, hawks and eagles
                     1 Subfamily Elaninae Blyth - smooth-clawed kites see Subfamily Accipitrinae Vieillot, 1816
                     2 Subfamily Perninae Scarlato & Starobogatov, 1979 see Subfamily Accipitrinae Vieillot, 1816
                     3 Subfamily Milvinae Vigors - true kites see Subfamily Accipitrinae Vieillot, 1816
                     4 Subfamily Accipitrinae Vieillot, 1816 - hawks, eagles
                     5 Subfamily Buteoninae Vigors - buzzards & eagles see Subfamily Accipitrinae Vieillot, 1816
                     6 Subfamily Aegypiinae see Subfamily Accipitrinae Vieillot, 1816
                     7 Subfamily Circinae Sundevall, 1836 - harriers see Subfamily Accipitrinae Vieillot, 1816
                     8 Subfamily Circaëtinae see Subfamily Circaetinae Blyth
                     9 Subfamily Pandioninae - osprey see Family Pandionidae Sclater & Salvin, 1873