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FILES - A picture taken 11 June 2007 sho

Science News

Knut the polar bear

Berlin's beloved polar bear Knut, who rose to stardom when he was hand-raised by zoo keepers after being rejected by his mother at birth, died on Saturday, a zoo official said.

Image: File photo of visitors watching Polar bear cub Knut in Berlin zoo

Visitors watch polar bear cub Knut in the Berlin zoo, March 24, 2007. Knut, the polar bear who became a global celebrity as a cute cub, 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 an autopsy.

Arnd Wiegmann / X00493
Image: Thomas Doerflein

Knut has his first public appearance with his keeper Thomas Doerflein in the Berlin zoo, March 23, 2007.

Herbert Knosowski / AP
The combo of pictures taken 28 March 200

Knut playing with a blanket at his enclosure of the Berlin zoo, March 28, 2007.

Marcus Brandt / AFP
FILES - A picture taken 11 June 2007 sho

Knut plays with a foot of his minder Thomas Doerflein at the zoo in Berlin, June 11, 2007.

Marcus Brandt / AFP
Knut Turns One Year Old

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.

Anita Bugge / WireImage
One-year old polar bear Knut is refelcte

Knut is refelcted in a window as he takes a bath Jan. 11, 2008 in his enclosure at the zoo in Berlin.

Axel Schmidt / AFP
Image: Polar bear Knut

Knut takes a bath in his outdoor enclosure at the zoo in Berlin, Germany, Aug. 6, 2009.

Rainer Jensen / DPA
Image: Polar bear Knut awaits Gianna

Knut swims in common duckweed at the zoo of Berlin, Sept. 14, 2009.

Rainer Jensen / DPA

Knut, right, and Giovanna, a female polar bear on loan from the Munich zoo, play tug of war as they swim in their enclosure at Berlin's Zoologischer Garten zoo Jan. 8.

John Macdougall / AFP
Knut Enjoys Giovanna's Company

Polar bears Knut, left, and Giovanna cuddle at their enclosure at the Berlin zoo on March 4, 2010 in Berlin, Germany.

Sean Gallup / Getty Images Europe
Image: This three-picture combo shows Polar bea

Knut interacts with with six-year-old visitor Nane and her cushy polar bear "Knut" at the Tiergarten zoo in Berlin on Oct. 19. German newspapers reported today that the world famous polar bear is being bullied by his fellow polar bears in their enclosure in the Berlin zoological garden.

Odd Andersen / AFP
Image: (FILES) - Picture taken on January 8, 20

Knut rolls in the snow in his enclosure at Berlin's Zoologischer Garten zoo, Jan. 8, 2010.

John Macdougall / AFP
Image: Knut and His Gal Get Spring Fever at Berlin Zoo

Knut stands in his enclosure, March 26, 2010.

Action Press / Action Press
Image: Knut

Knut yawns in his enclosure at the zoo in Berlin, Dec. 10, 2010.

Johannes Eisele / AFP
Image: Children stand in front of polar bear Kn

Children stand in front of polar bear Knut's enclosure at the Berlin zoo on March 21, 2011. Germany was in stunned mourning after the sudden and premature death of Knut, Berlin's world-famous polar bear, who died on March 19. Zoo visitors signed a condolence book, left notes, flowers and candles in tribute to the beloved bear.

Johannes Eisele / AFP