Up to three metres high and 770kg in weight, polar bears can still run at up to 40mph in short bursts. Fierce predators who live mainly off seals, they can also manage a walrus for breakfast in a stomach with a capacity of 70kg. These are intriguing, amazing mammals, playing out their lives in some of the coldest and most isolated places on earth. How are they adapted to survive in such inhospitable environments? Is man's contribution to global warming the greatest threat to the last refuge of the polar bear - the Arctic?
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