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Pictures | Sun Mar 20, 2011 | 10:40am EDT

Farewell Knut

<p>Polar bear cub Knut plays in the Berlin zoo in this undated picture, released on March 2, 2007. Knut, born on December 5, 2006, had to be hand fed every four hours by zoo employee Thomas Doerflein after its mother Tosca refused the baby.  REUTERS/Handout/Archiv Zoo Berlin </p>

Polar bear cub Knut plays in the Berlin zoo in this undated picture, released on March 2, 2007. Knut, born on December 5, 2006, had to be hand fed every four hours by zoo employee Thomas Doerflein after its mother Tosca refused the baby. ...more

Polar bear cub Knut plays in the Berlin zoo in this undated picture, released on March 2, 2007. Knut, born on December 5, 2006, had to be hand fed every four hours by zoo employee Thomas Doerflein after its mother Tosca refused the baby. REUTERS/Handout/Archiv Zoo Berlin

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<p>Polar bear cub Knut is reflected in the water during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Tobias Schwarz </p>

Polar bear cub Knut is reflected in the water during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Tobias Schwarz

Polar bear cub Knut is reflected in the water during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Tobias Schwarz

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<p>Berlin zoo employee Thomas Doerflein plays with polar bear cub Knut during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Arnd Wiegmann </p>

Berlin zoo employee Thomas Doerflein plays with polar bear cub Knut during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Arnd Wiegmann

Berlin zoo employee Thomas Doerflein plays with polar bear cub Knut during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Arnd Wiegmann

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<p>Polar bear cub Knut plays with a blanket during during the bear's first presentation in Berlin zoo, March 23, 2007.  REUTERS/Arnd Wiegmann </p>

Polar bear cub Knut plays with a blanket during during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Arnd Wiegmann

Polar bear cub Knut plays with a blanket during during the bear's first presentation in Berlin zoo, March 23, 2007. REUTERS/Arnd Wiegmann

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<p>Visitors watch polar bear cub Knut at an enclosure in Berlin zoo April 9, 2007. REUTERS/Arnd Wiegmann </p>

Visitors watch polar bear cub Knut at an enclosure in Berlin zoo April 9, 2007. REUTERS/Arnd Wiegmann

Visitors watch polar bear cub Knut at an enclosure in Berlin zoo April 9, 2007. REUTERS/Arnd Wiegmann

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<p>Polar bear cub 'Knut' swims in an enclosure at the Berlin Zoo June 17, 2007. REUTERS/Tobias Schwarz </p>

Polar bear cub 'Knut' swims in an enclosure at the Berlin Zoo June 17, 2007. REUTERS/Tobias Schwarz

Polar bear cub 'Knut' swims in an enclosure at the Berlin Zoo June 17, 2007. REUTERS/Tobias Schwarz

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<p>Polar bear cub 'Knut' relaxes in an enclosure at the Berlin Zoo June 17, 2007. REUTERS/Tobias Schwarz </p>

Polar bear cub 'Knut' relaxes in an enclosure at the Berlin Zoo June 17, 2007. REUTERS/Tobias Schwarz

Polar bear cub 'Knut' relaxes in an enclosure at the Berlin Zoo June 17, 2007. REUTERS/Tobias Schwarz

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<p>Polar bear cub 'Knut' is pictured in an enclosure at the Berlin Zoo July 7, 2007. REUTERS/Tobias Schwarz </p>

Polar bear cub 'Knut' is pictured in an enclosure at the Berlin Zoo July 7, 2007. REUTERS/Tobias Schwarz

Polar bear cub 'Knut' is pictured in an enclosure at the Berlin Zoo July 7, 2007. REUTERS/Tobias Schwarz

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<p>Polar bear cub Knut plays at an enclosure in Berlin zoo October 2, 2007.  REUTERS/Arnd Wiegmann</p>

Polar bear cub Knut plays at an enclosure in Berlin zoo October 2, 2007. REUTERS/Arnd Wiegmann

Polar bear cub Knut plays at an enclosure in Berlin zoo October 2, 2007. REUTERS/Arnd Wiegmann

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<p>Polar bear cub Knut sleeps in his enclosure at Berlin zoo December 4, 2007. REUTERS/Hannibal Hanschke </p>

Polar bear cub Knut sleeps in his enclosure at Berlin zoo December 4, 2007. REUTERS/Hannibal Hanschke

Polar bear cub Knut sleeps in his enclosure at Berlin zoo December 4, 2007. REUTERS/Hannibal Hanschke

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<p>A white rose and a letter of condolence is pictured on the fence of the enclosure of polar bear cub Knut (background) in Berlin zoo, September 23, 2008. REUTERS/Tobias Schwarz </p>

A white rose and a letter of condolence is pictured on the fence of the enclosure of polar bear cub Knut (background) in Berlin zoo, September 23, 2008. REUTERS/Tobias Schwarz

A white rose and a letter of condolence is pictured on the fence of the enclosure of polar bear cub Knut (background) in Berlin zoo, September 23, 2008. REUTERS/Tobias Schwarz

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<p>Polar bear Knut is pictured two days ahead of his second birthday in his enclosure at the Berlin Zoo, December 3, 2008. REUTERS/Tobias Schwarz </p>

Polar bear Knut is pictured two days ahead of his second birthday in his enclosure at the Berlin Zoo, December 3, 2008. REUTERS/Tobias Schwarz

Polar bear Knut is pictured two days ahead of his second birthday in his enclosure at the Berlin Zoo, December 3, 2008. REUTERS/Tobias Schwarz

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<p>Polar bear Knut eats his 'birthday cake' during his second birthday celebrations in his enclosure at the Berlin Zoo December 5, 2008. REUTERS/Johannes Eisele </p>

Polar bear Knut eats his 'birthday cake' during his second birthday celebrations in his enclosure at the Berlin Zoo December 5, 2008. REUTERS/Johannes Eisele

Polar bear Knut eats his 'birthday cake' during his second birthday celebrations in his enclosure at the Berlin Zoo December 5, 2008. REUTERS/Johannes Eisele

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<p>Polar bear Knut eats his 'birthday cake' during his second birthday celebrations in his enclosure at the Berlin Zoo December 5, 2008. REUTERS/Johannes Eisele </p>

Polar bear Knut eats his 'birthday cake' during his second birthday celebrations in his enclosure at the Berlin Zoo December 5, 2008. REUTERS/Johannes Eisele

Polar bear Knut eats his 'birthday cake' during his second birthday celebrations in his enclosure at the Berlin Zoo December 5, 2008. REUTERS/Johannes Eisele

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<p>Polar bear Knut walks out of a cave in his enclosure at the Berlin Zoo, July 7, 2009. REUTERS/Fabrizio Bensch </p>

Polar bear Knut walks out of a cave in his enclosure at the Berlin Zoo, July 7, 2009. REUTERS/Fabrizio Bensch

Polar bear Knut walks out of a cave in his enclosure at the Berlin Zoo, July 7, 2009. REUTERS/Fabrizio Bensch

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<p>Female polar bear Giovanna (L) and male polar bear Knut play in their enclosure at Berlin zoo October 6, 2009. REUTERS/Fabrizio Bensch </p>

Female polar bear Giovanna (L) and male polar bear Knut play in their enclosure at Berlin zoo October 6, 2009. REUTERS/Fabrizio Bensch

Female polar bear Giovanna (L) and male polar bear Knut play in their enclosure at Berlin zoo October 6, 2009. REUTERS/Fabrizio Bensch

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<p>Polar bear Knut yawns in an enclosure in the zoo in Berlin, December 27, 2010. REUTERS/Thomas Peter </p>

Polar bear Knut yawns in an enclosure in the zoo in Berlin, December 27, 2010. REUTERS/Thomas Peter

Polar bear Knut yawns in an enclosure in the zoo in Berlin, December 27, 2010. REUTERS/Thomas Peter

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<p>Polar bear Knut stands on his hind legs in an enclosure in the zoo in Berlin, December 27, 2010. REUTERS/Thomas Peter </p>

Polar bear Knut stands on his hind legs in an enclosure in the zoo in Berlin, December 27, 2010. REUTERS/Thomas Peter

Polar bear Knut stands on his hind legs in an enclosure in the zoo in Berlin, December 27, 2010. REUTERS/Thomas Peter

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<p>A woman places a rose at the polar bear enclosure in Berlin zoo, March 20, 2011. Knut, the polar bear who became a global celebrity as a cute cub, died in Berlin zoo aged just 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. REUTERS/Tobias Schwarz </p>

A woman places a rose at the polar bear enclosure in Berlin zoo, March 20, 2011. Knut, the polar bear who became a global celebrity as a cute cub, died in Berlin zoo aged just four. Knut, the first polar bear born at the zoo for more than 30 years,...more

A woman places a rose at the polar bear enclosure in Berlin zoo, March 20, 2011. Knut, the polar bear who became a global celebrity as a cute cub, died in Berlin zoo aged just 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. REUTERS/Tobias Schwarz

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<p>An information board is decorated with items to remember polar bear Knut at the polar bear enclosure in Berlin zoo, March 20, 2011. REUTERS/Tobias Schwarz </p>

An information board is decorated with items to remember polar bear Knut at the polar bear enclosure in Berlin zoo, March 20, 2011. REUTERS/Tobias Schwarz

An information board is decorated with items to remember polar bear Knut at the polar bear enclosure in Berlin zoo, March 20, 2011. REUTERS/Tobias Schwarz

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