Knut, the polar bear(北极熊) who became a global celebrity as a cute cub(幼崽), died in at the Berlin zoo March 19, 2011 at the age of four. Knut, the first polar bear born at the zoo for more than 30 years, was rejected by his mother and fed instead by his keeper Thomas Doerflein. Thousands of visitors came to watch keeper and cub playing together, and Knut's fame soon spread around the world. The cause of death was unknown and he will undergo(经历) an autopsy(尸体解剖).
Visitors watch polar bear cub Knut in the Berlin zoo, March 24, 2007.
Knut has his first public appearance with his keeper Thomas Doerflein in the Berlin zoo, March 23, 2007.
Knut playing with a blanket at his enclosure(圈占地) of the Berlin zoo, March 28, 2007.
Knut plays with a foot of his minder Thomas Doerflein at the zoo in Berlin, June 11, 2007.
Knut eats his one-year birthday "cake" at the Berlin zoo Dec. 5, 2007, in Berlin, Germany. Zoo officials celebrated Knut's one year birthday by inviting the public and the media to watch Knut eat his cake, whose ingredients included rice, potatoes, carrots and a whole fish.
Knut is refelcted in a window as he takes a bath Jan. 11, 2008 in his enclosure at the zoo in Berlin.
Knut takes a bath in his outdoor enclosure at the zoo in Berlin, Germany, Aug. 6, 2009.
Knut swims in common duckweed(浮萍) at the zoo of Berlin, Sept. 14, 2009.
Knut, right, and Giovanna, a female polar bear on loan(暂借) from the Munich zoo, play tug of war as they swim in their enclosure at Berlin's Zoologischer Garten zoo Jan. 8.
Knut rolls in the snow in his enclosure at Berlin's Zoologischer Garten zoo, Jan. 8, 2010.
Knut yawns(打哈欠) in his enclosure at the zoo in Berlin, Dec. 10, 2010.