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Arctic shrew : ウィキペディア英語版 | Arctic shrew
The Arctic shrew (''Sorex arcticus''), also known as the blackback shrew or saddlebacked shrew, is a medium-sized shrew found in Canada and the northern United States. Separate species status has been proposed for the maritime shrew (''Sorex maritimensis'') which is found in New Brunswick and Nova Scotia and had been considered to be a subspecies of the Arctic shrew. The tundra shrew (''Sorex tundrensis'') was formerly considered to be a subspecies of the Arctic shrew. ==Physical description== The Arctic shrew is most distinctive in its tricolored fur. It is dark brown or black on its back from its head to the base of its tail, while its flanks are a lighter brown, and its underside is lighter still grayish brown. Even its tail is bi-colored, dark brown on the dorsal side, and gradually fading to a lighter brown on the ventral side. The fur is grayer in winter time, and its tricolor is most marked during the winter months from October to June, for the fur is thicker and brighter. Arctic shrews molt twice a year, and the tricolor bands in the fur are less prominent in younger shrews. Its body length ranges from 10 cm to 12 cm including a 4 cm long tail. Its mass may range from 5 g to 13 g and it possesses thirty-two teeth with and average metabolism of 4.7 kilocalories a day.
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