Berlin zoo's superstar polar bear Knut w

Berlin zoo's superstar polar bear Knut walks through his enclosure at the zoo in Berlin on September 23, 2008, one day after police confirmed that Knut's keeper Thomas Doerflein has died. There were no signs of any foul play and so far no indications the 44-year-old committed suicide although investigations were continuing, a police spokeswoman said. Knut shot to fame as a cub in 2007, drawing huge crowds and even appearing on the cover of glossy US magazine Vanity Fair. AFP PHOTO DDP/AXEL SCHMIDT GERMANY OUT (Photo credit should read AXEL SCHMIDT/DDP/AFP via Getty Images)