当食物供给量足够大时，旅鼠过着正常、不受干扰的生活。
When their food supply is sufficiently large, the lemmings live a normal, undisturbed life.
冬季为白色皮毛且一些爪非常大的北美洲旅鼠。
North American lemming having a white winter coat and some claws much enlarged.
冬季为白色皮毛且一些爪非常大的北美洲旅鼠。
North American lemming having a white winter coat and some claws much enlarged.
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