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Lemming (Lemmus lemmus), Setesdalheia, Southern Norway
During Winter, lemmings live in tunnels in the snow, where warm pockets of air near the ground provide comfort and access to grass and moss. Warmer temperatures in recent years have made snow conditions less suited to lemming behaviour and as a result, lemming numbers have not been so high.
These small changes in the Arctic cascade right through the ecosystem, forcing animals such as the arctic fox and snowy owl to seek alternative food sources - such as geese, grouse and ptarmigan.