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The Papuan harrier (''Circus spilothorax'') is a bird of prey native to New Guinea which belongs to the harrier genus ''Circus''. It is commonly classified as a subspecies of the eastern marsh harrier (''Circus spilonotus'') of eastern Asia. However it may be a separate species or alternatively a subspecies of the swamp harrier (''Circus approximans'') of Australasia. It is thinly scattered across the whole of New Guinea except for the Vogelkop peninsula in the west. There are several unconfirmed reports from Australia but the bird can easily be confused with the swamp harrier. It inhabits grassland and wetlands up to 3800 m above sea-level. It hunts low over open ground searching for small mammals, birds and lizards. The adult male is usually silvery-grey with black head, throat, back and wing-markings and white underparts. Adult females are brown with a pale rump, barred tail and streaked underparts. Juveniles are blackish-brown with cream-coloured markings on the head, more extensive in the female. The length of the bird varies from 47 to 54 cm; females are larger than the males. In the central highlands and the Sepik valley there is a dark morph; males of this form are mostly blackish with a grey tail and the females are mostly dark brown. ==References== * Brian J. Coates & William S. Peckover (2001), ''Birds of New Guinea and the Bismarck Archipelago: a photographic guide'', Dove Publications, Alderley, Australia. * Graham Pizzey & Frank Knight (1997) ''The Graham Pizzey & Frank Knight Field Guide to the Birds of Australia'', HarperCollins, London, UK. 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「Papuan harrier」の詳細全文を読む スポンサード リンク
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