Parent: Accipitridae (Eagles)

└─ Circus (Harriers)

└─── Circus aeruginosus (Western marsh harrier)

└─── Circus approximans (Swamp harrier)

└─── Circus assimilis (Spotted harrier)

└─── Circus buffoni (Long-winged harrier)

└─── Circus cinereus (Cinereous harrier)

└─── Circus cyaneus (Northern harrier)

└─── Circus macrosceles (Malagasy harrier)

└─── Circus macrourus (Pallid harrier)

└─── Circus maillardi (Malagasy marsh harrier)

└─── Circus maurus (Black harrier)

└─── Circus melanoleucos (Pied harrier)

└─── Circus pygargus (Montagu's harrier)

└─── Circus ranivorus (African marsh harrier)

└─── Circus spilonotus (Eastern marsh harrier)

└─── Circus spilothorax (Papuan harrier)