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The largest wild bears ever weighed—more than 800 kg (1760 lb)—have been polar bears. However, most male polar bears weigh an average of about 350 kg (about 880 lb), and most females weigh about 250 kg (550 lb). Polar bears have a strong navigational sense, an extremely good sense of smell, and they are unusually clever at solving problems in order to obtain food. They eat primarily ringed seals, and occasionally bearded seals, walruses, or white whales. They also feed on berries, sedges, mussels, and kelp.
As with other true bears, polar-bear mothers and young form strong bonds. The young are very small when born: about 1 kg (about 2 lb). Their eyes remain closed for about 40 days and they must nurse every few hours. The mother holds them close to keep them warm. Except during the breeding season, male polar bears are solitary and roam over vast expanses of sea ice while hunting. During the breeding season (May to June), the males fight furiously over females.
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