Knut the celebrity polar bear has been through a lot in his young life. First he was abandoned by his mother. Then animal rights campaigners reportedly called for him to be put down rather than face an unnatural childhood being hand-reared.
By the time he was three months old, he faced the stresses of global superstardom as hundreds of thousands of fans queued up to see him play with his keeper, Thomas Dörflein, and camera crews from around the world covered his every move.
Then came the...
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