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Siberian crane
The Siberian crane (''Leucogeranus leucogeranus''), also known as the Siberian white crane or the snow crane, is a bird of the family Gruidae, the cranes. They are distinctive among the cranes, adults are nearly all snowy white, except for their black primary feathers that are visible in flight and with two breeding populations in the Arctic tundra of western and eastern Russia. The eastern populations migrate during winter to China while the western population winters in Iran and formerly, in India and Nepal. Among the cranes, they make the longest distance migrations. Their populations, particularly those in the western range, have declined drastically in the 20th century due to hunting along their migration routes and habitat degradation. The world population was estimated in 2010 at about 3,200 birds, mostly belonging to the eastern population with about 95% of them wintering in the Poyang Lake basin in China, a habitat that may be altered by the Three Gorges Dam. In western Siberia there are only around ten of these cranes in the wild.
==Description==
Adults of both sexes have a pure white plumage except for the black primaries, alula and primary coverts. The forecrown, face and side of head is bare and brick red, the bill is dark and the legs are pinkish. The iris is yellowish. Juveniles are feathered on the face and the plumage is dingy brown. There are no elongated tertial feathers as in some other crane species.〔 During breeding season, both the male and female cranes are often seen with mud streaking their feathers. They dip their beaks in mud and smear it on their feathers. The call is very different from the trumpeting of most cranes and is a goose-like high pitched whistling ''toyoya''. They typically weigh and stand about tall. The wingspan is and length is . Males are on average larger than females.〔〔(Grus leucogeranus ) (2011).〕〔(Grue de Sibérie ). oiseaux.net〕 There is a single record of an outsized male of this species weighing .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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