International news agency reported on 25 Jan. The female polar bear by tracking device, found that it had to swim for the 9 days to find a new sheet of ice rafting
.At present, the polar bear populations have increased. Make it to swim hundreds of miles to find food source. In the midst of the climate change of the ocean!From the results of the office of the United States National Geological Survey Was published in biology pole, expressed concern that "we insist that Ability in swimming distance of polar bears.But we noted that swim long distances, and travel through deep water, with ice cube, but many small, will make it waste energy greatly. And the ability of reproduction are reduced as well. "
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