The noticeable marked Norway lemming (Lemmus lemmus) is active during the day and at night; times of activity are alternating with small breaks. In the winter, it constructs tunnels under the snow, so that it can search for food on the ground. In spring, when the snow is still there, the mating season begins, and during the summer, the no less than 8 litters with 6 young each are reared.
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