This citizen journalism photo acquired by the AP from an Italian tourist visiting the zoo and taken on a mobile phone on Saturday, March 19, 2011 shows the body of dead polar bear Knut at the Zoo in Berlin. Bear keeper Heiner Kloes of the zoo said that four-year-old Knut died Saturday afternoon while alone on his compound and that it was not yet clear why he died. (AP Photo/Carlo Anfossi)
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