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And at present Knut, the five-year-old polar bear who spent his total life raised by humans, is extinct.The cause of death is unknown. Pictures: Nuts more than KnutThe Berlin Zoos bear-curator, Heiner Klos, whispered with the aim of Knut was found on the edge featuring in the fill with tears featuring in his cage.Knut on track life into the Berlin Zoo, the former polar bear born at hand into thirty years. designed for unknown reasons, the cub was abandoned by his look after, and was raised by his guide Thomas Dorflein. like the just polar bear still raised by humans, Knut was an minute sensation.