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Many bears of northern regions are assumed to hibernate in the winter. In fact, they don't hibernate. Their body temperature sinks a moderate amount and they can be easily awakened. Laws have been passed in many areas of the world to protect bears from hunters or habitat destruction. Bears in captivity used to be trained to dance, box, or unicycle, but it is now controversial to use animals in this way. Bears have an average life expectancy of 25–40 years. Polar bears are the largest type of bear, indeed one of the largest extant carnivores. Sun bears are the smallest, only a bit smaller than the average woman.
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