Bears hibernate during the winter, which is essentially like a very deep sleep. This allows them to slow their metabolism and thus need for food intake during the harshest months of the year. While bears can have large ranges in which they move during their active season, they do not migrate in the same sense that some birds and whales migrate between breeding grounds, winter nests etc.
Most bears do not migrate, they instead hibernate (go into a deep sleep for the colder months). However, polar bears migrate in a way. They must follow their prey, which migrate during the colder months. Polar bears do experience the slowed heart rate and some other characteristics of hibernation.
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