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For polar bears, the summer melt of Arctic ice is the toughest time of year...
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Watch video HD: Polar Bear on Thin Ice - Nature's Great Events: The Great Melt - BBC One online without registration, duration hours minute second in high quality. This video was added by user BBC 10 February 2009, don't forget to share it with your friends and acquaintances, it has been viewed on our site 712,618 once and liked it 2.8 thousand people.