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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: A Sumantran tiger cub seen on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: A female Bengal tiger in her cage at the zoo of Rio de Janeiro, Brazil, on April 29, 2011. AFP PHOTO/VANDERLEI ALMEIDA
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah is seen with her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: A Sumatran tiger cub is seen on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah is seen with one of her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: A white tiger (Panthera tigris) is seen at the zoo in Cali, Colombia, on April 21, 2012. Colombia has the second largest biodiversity in the world. AFP PHOTO/Luis ROBAYO
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From Getty: Newborn Siberian tigers Virgil, Thrax and Manu are presented at the Budapest Zoo and Botanic Garden in the Hungarian capital on July 4, 2011. The eight-week-old tigers were presented to the press for the first time with their health checkup and ID chips implanted by the chief doctor of the zoo. AFP PHOTO / ATTILA KISBENEDEK
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From Getty: Tigers play in water at a tiger buddhist temple in Karnchanaburi province, western Thailand on April 24, 2012. Thailand is one of just 13 countries hosting fragile tiger populations and is a hub of international smuggling. Worldwide, numbers are estimated to have fallen to only 3,200 tigers from approximately 100,000 a century ago. AFP PHOTO/PORNCHAI KITTIWONGSAKUL
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From Getty: Tigers play in water at a tiger buddhist temple in Karnchanaburi province, western Thailand on April 24, 2012. Thailand is one of just 13 countries hosting fragile tiger populations and is a hub of international smuggling. Worldwide, numbers are estimated to have fallen to only 3,200 tigers from approximately 100,000 a century ago. AFP PHOTO/PORNCHAI KITTIWONGSAKUL
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From Getty: Two white tigers cub are pictured on December 5, 2011 at the zoological park of Cerza in Hermival-les-Vaux, northern France. The three-year-old Lisa gave birth on October 8, 2011 to two white tigers belonging to a relatively rare species. AFP PHOTO KENZO TRIBOUILLARD
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From Getty: A white tiger cub is pictured on December 5, 2011 at the zoological park of Cerza in Hermival-les-Vaux, northern France. The three-year-old Lisa gave birth on October 8, 2011 to two white tigers belonging to a relatively rare species. AFP PHOTO KENZO TRIBOUILLARD
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah is seen with one of her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: A white tiger is pictured in its compound on June 30, 2011, at the Amneville's zoo, eastern France. AFP PHOTO / JEAN-CHRISTOPHE VERHAEGEN
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From Getty: Tigers play in water at a tiger buddhist temple in Karnchanaburi province, western Thailand on April 24, 2012. Thailand is one of just 13 countries hosting fragile tiger populations and is a hub of international smuggling. Worldwide, numbers are estimated to have fallen to only 3,200 tigers from approximately 100,000 a century ago. AFP PHOTO/PORNCHAI KITTIWONGSAKUL
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From Getty: A tiger (Panthera tigris) is seen in a lake in the zoo of Cali, Colombia, on April 21, 2012. Colombia has the second largest biodiversity in the world. AFP PHOTO/Luis ROBAYO
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From Getty: A white tiger plays with a plant at the zoo on December 21, 2011 in Sao Paulo, Brazil. AFP PHOTO / Yasuyoshi Chiba
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From Getty: A Siberian tiger sniffs a paper-made snowman given by the staff as a Christmas present on December 21, 2011 in Sao Paulo, Brazil. AFP PHOTO / Yasuyoshi Chiba
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From Getty: SYDNEY, AUSTRALIA - DECEMBER 21: A Sumatran Tiger cub investigates a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - DECEMBER 21: A Sumatran Tiger tears apart a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - DECEMBER 21: Sumatran Tiger cubs tear apart a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - DECEMBER 21: A Sumatran Tiger tears apart a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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From Getty: Two white tigers cub are pictured on December 5, 2011 at the zoological park of Cerza in Hermival-les-Vaux, northern France. The three-year-old Lisa gave birth on October 8, 2011 to two white tigers belonging to a relatively rare species. AFP PHOTO KENZO TRIBOUILLARD
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From Getty: A white tiger, Lisa, is pictured on December 5, 2011 in the zoological park of Cerza in Hermival-les-Vaux, northern France. The three-year-old Lisa gave birth on October 8, 2011 to two white tigers belonging to a relatively rare species. AFP PHOTO KENZO TRIBOUILLARD
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From Getty: A white tiger, Lisa, runs on December 5, 2011 in the zoological park of Cerza in Hermival-les-Vaux, northern France. The three-year-old Lisa gave birth on October 8, 2011 to two white tigers belonging to a relatively rare species. AFP PHOTO KENZO TRIBOUILLARD
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From Getty: A white tiger, Lisa, drinks water on December 5, 2011 in the zoological park of Cerza in Hermival-les-Vaux, northern France. The three-year-old Lisa gave birth on October 8, 2011 to two white tigers belonging to a relatively rare species. AFP PHOTO KENZO TRIBOUILLARD
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah plays with one of her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah is seen on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah is seen with one of her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: A Sumatran tiger cub looks through the glass of the tiger display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: SYDNEY, AUSTRALIA - OCTOBER 25: Sumatran tiger Jumilah is seen with one of her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)
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From Getty: Two months old Sumatran tiger cubs play in their exclosure on September 2, 2011 in Prague Zoo in the capital city. AFP PHOTO/ MICHAL CIZEK
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From Getty: A Malayan tiger, a subspecies of tiger found in the southern and central parts of the Malay Peninsula, rests in his enclosure at the Zoo of Prague on July 24, 2011. AFP PHOTO / MICHAL CIZEK
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From Getty: A white tiger is pictured in its compound on June 30, 2011, at the Amneville's zoo, eastern France. AFP PHOTO / JEAN-CHRISTOPHE VERHAEGEN
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From Getty: A female Bengal tiger in her cage at the zoo of Rio de Janeiro, Brazil, on April 29, 2011. AFP PHOTO/VANDERLEI ALMEIDA
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A Berlin zoo welcomes four adorable tiger cubs.