Order Accipitriformes Vieillot - diurnal birds of prey see Order Falconiformes Sharpe, 1874
   Suborder Accipitres (C. Linnaeus, 1758) - hawks
     Family Accipitridae Vieillot, 1816 - secretary bird, osprey, kites, hawks and eagles
       Subfamily Circinae Sundevall, 1836 - harriers see Subfamily Accipitrinae Vieillot, 1816
         1 Genus †Thegornis Ameghino, 1895
         2 Genus Circus Lacépède, 1799