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epa02644408 Postcards showing photos of late polar bear Knut are sold at a gift shop of the Zoo in Berlin, Germany, 20 March 2011. Germany's best-loved and biggest animal star, the polar bear Knut born in captivity in Berlin Zoo, has died aged four, his keeper announced 19 March 2011. Heiner Kloes, the keeper, found the four-year-old's body floating in the water of the pool in his enclosure. It was unclear exactly how he died. EPA/BRITTA PEDERSEN