3The polar bear is the biggest and most powerful of the animals that are able to survive the hostile climate of the Arctic. Cubs are born during the cold dark winter, even though they start out with only a thin coat of fur and weigh a little over one pound. The mothers raise and teach them so they may grow and survive in the wild. Here is information about how polar bears swim and hunt, how they keep warm and dry, and the many other ways they adapt to their environment.