Picture taken December 5, 2007 shows Knut the polar bear as he celebrates his first birthday at Berlin's zoo (Zoologischer Garten). Germany was in stunned mourning after the sudden and premature death of Knut, Berlin's world-famous polar bear, who died on March 19, 2011, at the end of what animal welfare groups said was an unhappy, short life Flowers are placed at the enclosure in Berlin zoo,