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There are about 200,000 Pacific Walruses; about 3000 are harvested annually by Alaskan natives. They have long tusks, which are elongated canines used for fighting and display. Ivory from the tusks is used for carving. The penis bone of the male is called an oosik by the natives, and is used in making knives. The only natural enemies of the walrus are man and the polar bear. Polar bears hunt walruses by rushing at them, trying to get the herd to flee, then picking off calves or other stragglers.