A polar bear swims underwater in the St-Felicien Wildlife Zoo in St-Felicien, Quebec, Canada October 31, 2011. According to Environment Canada, Canada is home to around 15,000 of the estimated 20,000 polar bears in the world. The U.S. (Alaska), Russia, Denmark (Greenland) and Norway are the other four countries where polar bears can be found. REUTERS/Mathieu Belanger
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