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Rock ptarmigan
The rock ptarmigan (''ラテン語:Lagopus muta'') is a medium-sized gamebird in the grouse family. It is known simply as the ptarmigan in the UK and in Canada, where it is the official bird for the territory of Nunavut, Canada, and the official game bird for the province of Newfoundland and Labrador, Canada,〔http://www.heritage.nf.ca/facts4.html〕 and colloquially as the snow chicken in the United States. In Japan it is known as the ''raichō'' (雷鳥), which means "thunder bird". It is the official bird of Toyama Prefecture and is a protected species nationwide.〔:ja:ライチョウ〕
==Description==
The rock ptarmigan is long (tail ) with a wing-span of . It is slighter smaller than the willow ptarmigan by about 10%.〔 The male's "song" is a loud croaking.
The rock ptarmigan is seasonally camouflaged; its feathers moult from white in winter to brown in spring or summer. The breeding male has greyish upper parts with white wings and under parts. In winter, its plumage becomes completely white except for the black tail. It can be distinguished from the winter willow ptarmigan (willow ptarmigan in North America) by habitat—the rock ptarmigan prefers higher elevations and more barren habitat; it is also smaller with a more delicate bill.
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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