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The rock vole (''Microtus chrotorrhinus'') is a medium-sized vole found in eastern North America. It is also called the yellow-nosed vole. This species is similar in appearance to the larger Taiga vole. It has short ears and a long tail which is paler underneath. The fur is greyish-brown with grey underparts and a yellowish nose. Its length avereages long with a 5-cm tail, and it weighs about . They are found on moist rocky slopes in eastern Canada and the northeastern United States. They make runways through the surface growth and shallow underground burrows. They are usually found in small colonies. They feed on grasses, mosses, underground fungi and berries (especially bunchberry), and also sometimes on caterpillars. Predators include hawks, owls, snakes and small carnivorous mammals. The female vole has two or three litters of four to seven young. They are active year-round, mainly during the day, but are rarely seen. It has been designated as a species of concern in some parts of its range. ==References== *Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. Pp. 894-1531 ''in'' Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore. 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「Rock vole」の詳細全文を読む スポンサード リンク
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