Definitions
1.NounA raptor in species Circus aeruginosus, which inhabits swampy ground.
2.NounAny member of the raptor genus Circus of similar appearance and habit to Circus aeruginosus.
An African marsh harrier (Circus ranivorus)
A western marsh harrier (Circus aeruginosus)
An eastern marsh harrier (Circus spilonotus),
A Papuan harrier (Circus spilonotus spilothorax or Circus spilothorax),
A swamp harrier (Circus approximans)
A Reunion harrier (Circus maillardi maillardi or Circus maillardi)
A Madagascar marsh harrier (Circus maillardi macrosceles or Circus macrosceles).
3.NounAn African marsh harrier (Circus ranivorus)
4.NounA western marsh harrier (Circus aeruginosus)
5.NounAn eastern marsh harrier (Circus spilonotus),
6.NounA Papuan harrier (Circus spilonotus spilothorax or Circus spilothorax),
7.NounA swamp harrier (Circus approximans)
8.NounA Reunion harrier (Circus maillardi maillardi or Circus maillardi)
9.NounA Madagascar marsh harrier (Circus maillardi macrosceles or Circus macrosceles).