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Polar bear on sea ice, Igloolik (Nunavut, Canada)
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Unlike other Arctic mammals such as the Arctic fox, the polar bear does not have a darker coat in summer. Its fur, in harmony with the melted snow, just yellows a little more. In fact, its hair is not white but unpigmented and hollow like human white hairs. They absorb violet and ultraviolet rays giving its whole fur a yellowish appearance.
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