Phylum Chordata Bateson, 1885 - chordates
   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
           Family Accipitridae Vieillot, 1816 - secretary bird, osprey, kites, hawks and eagles
             Genus Circus Lacépède, 1799
               01 Circus assimilis Jardine & Selby, 1828 - spotted harrier
               02 Circus maurus (Temminck, 1828) - black harrier
               03 Circus cyaneus (Linnaeus, 1766) - northern harrier
               04 Circus cinereus Vieillot, 1816 - cinereous harrier
               05 Circus macrourus (Gmelin, 1770) - pallid harrier
               06 Circus melanoleucos (Pennant, 1769) - pied harrier
               07 Circus pygargus (Linnaeus, 1758) - Montagu's harrier
               08 Circus aeruginosus (Linnaeus, 1758) - western marsh-harrier
               09 Circus ranivorus (Daudin, 1800) - African marsh-harrier
               10 Circus buffoni (Gmelin, 1788) - long-winged harrier