- Circus, genus Circus - a genus of haws comprising the harriers
--1 is a kind of bird genus
--1 is a member of Accipitridae, family Accipitridae
--1 has members:harrier; marsh harrier, Circus Aeruginosus; Montagu's harrier, Circus pygargus; marsh hawk, northern harrier, hen harrier, Circus cyaneus