Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
         Superorder Passerimorphae Sibley et al., 1988
           Order Ciconiiformes Bonaparte, 1854
             Suborder Ciconii see Suborder Ciconiae Bonaparte, 1854
               Infraorder Falconides Sharpe, 1874
                 Parvorder Accipitrida see Superfamily Accipitroidea Vieillot, 1816
                   Family Accipitridae Vieillot, 1816 - secretary bird, osprey, kites, hawks and eagles
                     Subfamily Accipitrinae Vieillot, 1816 - hawks, eagles
                       Genus Circus Lacépède, 1799
                         01 Circus aeruginosus (Linnaeus, 1758) - western marsh-harrier
                         02 Circus ranivorus (Daudin, 1800) - African marsh-harrier
                         03 Circus spilonotus Kaup, 1847 - eastern marsh-harrier
                         04 Circus approximans Peale, 1848 - swamp harrier
                         05 Circus maillardi Verreaux, 1862 - Madagascar marsh-harrier
                         06 Circus buffoni (Gmelin, 1788) - long-winged harrier
                         07 Circus assimilis Jardine & Selby, 1828 - spotted harrier
                         08 Circus maurus (Temminck, 1828) - black harrier
                         09 Circus cyaneus (Linnaeus, 1766) - northern harrier
                         10 Circus cinereus Vieillot, 1816 - cinereous harrier
                         11 Circus macrourus (Gmelin, 1770) - pallid harrier
                         12 Circus melanoleucos (Pennant, 1769) - pied harrier
                         13 Circus pygargus (Linnaeus, 1758) - Montagu's harrier