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However, the two species have mated intermittently for all that time, most likely coming into contact with each other during warming periods, when polar bears were driven onto land and brown bears migrated northward.
Due to the absence of human development in its remote habitat, it retains more of its original range than any other extant carnivore.
The 42 teeth of a polar bear reflect its highly carnivorous diet.
The hollow guard hairs of a polar bear coat were once thought to act as fiber-optic tubes to conduct light to its black skin, where it could be absorbed; however, this hypothesis was disproved by a study in 1998.
The range includes the territory of five nations: Denmark (Greenland), Norway (Svalbard), Russia, the United States (Alaska) and Canada.
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.
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Males have significantly longer hairs on their forelegs, which increase in length until the bear reaches 14 years of age.