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Polar bears sleep for several months, resting and sleeping while being well insulated by a blanket of snow. During this period, the bear lives off its stored body fat but, unlike smaller mammals that hibernate, the bear's body temperature, heart rate, and breathing rate slow down only very slightly so the animal can quickly arouse itself to full activity.

The environment affects the life of the polar bear a lot because if it was not so hot, they would not have to dig summer dens and need so much fat