These rodents display "boom and bust" population dynamics, typical of many Artic species. When densities are high nd food resources scarce, mass emigrations take place. Thy are active by night and day. The variable black, brown and yellowish pattern and almost tailess body is unmistakable.
Size: body 10-15cm tail 1-2cm
Young: two to six litters of up to 12; April-October
Diet: grazes and browses grasses, sedges, dwarf shrubs and mosses.
Status: common, but fluctuates in density!!!
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