A picture made available on 29 March 2015 shows polar bear Lars at the Rostock Zoo in Rostock, Germany, 26 March 2015. The father of famed polar bear Knut and the latest polar bear cub in Rostock will embark on a journey on 01 April 2015. Lars will help produce more polar bear cubs in Aalborg, Denmark. (Photo by Bernd Wuestneck/EPA)
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