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One bear swam continuously for 9 days in the frigid Bering Sea for 687 km (400 mi) to reach ice far from land. During the swim, the bear lost 22% of her body mass and her yearling cub died.Many attacks by brown bears are the result of surprising the animal, which is not the case with the polar bear.Their scientific name means "maritime bear" and derives from this fact.Polar bears hunt their preferred food of seals from the edge of sea ice, often living off fat reserves when no sea ice is present.These areas, known as the "Arctic ring of life", have high biological productivity in comparison to the deep waters of the high Arctic.In Hudson Bay, James Bay, and some other areas, the ice melts completely each summer (an event often referred to as "ice-floe breakup"), forcing polar bears to go onto land and wait through the months until the next freeze-up.The 42 teeth of a polar bear reflect its highly carnivorous diet.

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These five nations are the signatories of the International Agreement on the Conservation of Polar Bears, which mandates cooperation on research and conservation efforts throughout the polar bear's range.They can occasionally drift widely with the sea ice, and there have been anecdotal sightings as far south as Berlevåg on the Norwegian mainland and the Kuril Islands in the Sea of Okhotsk.It is difficult to estimate a global population of polar bears as much of the range has been poorly studied; however, biologists use a working estimate of about 20–25,000 or 22–31,000 polar bears worldwide.Males have significantly longer hairs on their forelegs, which increase in length until the bear reaches 14 years of age.The male's ornamental foreleg hair is thought to attract females, serving a similar function to the lion's mane.

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