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The swamp harrier (''Circus approximans'') also known as the marsh harrier, Australasian harrier, kāhu, swamp-hawk or New Zealand hawk. It is large, slim, and the most common bird of prey in New Zealand countryside. It is one of the few birds to have benefited from European-New Zealand settlement: It is a bird of open country and became firmly established after forests were cleared by Polynesians.〔A Guide to Canterbury Museum's Edgar Stead Hall of New Zealand Birds〕 The swamp harrier belongs to the sub-family Circinae and genus ''Circus'', which are represented worldwide, except Antarctica. The sub-family and genus are derived from the characteristic behavior of circling flight during courtship and hawking. ==Description== The swamp harrier is largely dark brown, becoming lighter with age, and has a distinct white rump. It hunts by flying slowly, low to the ground, on upswept wings. The body length is 50 to 58 cm (20–23 in), and the wingspan is 120 to 145 cm. The recorded weights of adults range from 580 to 1100 g, and females are significantly larger than the males. File:Circus approximans - Peter Murrel.jpg|Adult male soaring in flight File:Circus approximans -Coolart Wetlands, Mornington Peninsula, Australia -flying.jpg|Immature flying in Victoria, Australia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Swamp harrier」の詳細全文を読む スポンサード リンク
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