[Berlin, January 8. Image via Getty.]

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Knut, the 3-year-old polar bear, rolls in the snow in his enclosure at Berlin's Zoologischer Garten zoo January 8, 2010. With temperatures below zero and an ample supply of snow, Knut is finally experiencing his natural habitat. AFP PHOTO / JOHN MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)