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Listed as 'critically endangered' by the World Wildlife Fund, the black rhinoceros is native to Africa's tropical and subtropical grasslands, but ranges from Kenya to Cameroon to South Africa. The WWF estimates the population at 4,880 as of February, 2013

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A newly born rare Black Rhinoceros calf, believed to be a male, lies next to its mother in their enclosure at Chester Zoo in Chester, England, Friday Nov. 7, 2008. The calf, still yet to be named, was born to 10-year-old mother Kitani at the zoo nine days ago, and is the first rhinoceros calf born there in over ten years.PAUL THOMAS/The Associated Press

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The newly born Eastern Black Rhinoceros calf walks through its enclosure at Chester Zoo, northern England, October 31, 2008. The two-day-old calf, born to 10-year-old mum Kitani, is the first Eastern Black Rhinoceros to be born at the zoo in a decade.PHIL NOBLE/Reuters

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Four-day-old female black rhinoceros calf Akili stands next to her mother Ine in the enclosure at the Zoo in Berlin, Germany. The young calf weighs 30 kilograms (65 pounds) while the mother weighs 1,100 kilograms (2,425 pounds).Gero Breloer/The Associated Press

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The Kansas City Zoo's new baby rhinoceros, “little girl with no name,'” nuzzles up to her mother, Luyisa, Wednesday, Feb. 11, 2004. The female, which was born about Sunday Feb. 2, 2004, was estimated to weigh 75 pounds at the time of birth and is approximately 32 inches long and 23 inches tall. Eastern black rhinos are critically endangered and it is estimated that only about 500 exist. The Kansas City Zoo, which now has five eastern black rhinos, is home to approximately 1 percent of the entire world population.DAVID PULLIAM/The Associated Press

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A critically endangered black rhinoceros calf named Ajubu tried out his legs at the San Diego Zoo's Wild Animal Park, August 26, 2004. The 9-day-old male kept up with his first-time mother as she dashed around their habitat. An adult male, Jambia, which was the last black rhino to be born at the Wild Animal Park seven years ago, sired the rambunctious calf. To date, 10 black rhinos have been born at the Park. Black rhinoceros are now only found in small pockets of eastern and southern Africa, numbering at a mere 3,600. In 1970, there were 65,000 black rhinos throughout larger areas of Africa, but poaching and loss of habitat have caused a devastating decline in the population of all five rhino species.HO/Reuters

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A newly born baby Eastern Black Rhinoceros calf stands with her mother in their enclosure at Chester Zoo in Chester, northern England, May 18, 2009. The four-day-old calf is the second Eastern Black Rhino to be born at the zoo in eight months.Phil Noble/Reuters

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Volker Seding's Black Rhinoceros, Brookfield Zoo, top, is a photo of the animal trapped in a 'jungle room.'

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Kenya Wildlife Service game wardens load a black Rhino into a cage at the Nairobi National Park, July 23, 2004. The wardens are relocating twenty Black Rhinos from the Park to a ranch in eastern Kenya. In 1984, Kenya adopted a population conservation approach for the recovery of its black Rhinoceros following catastrophic decline in numbers, from 20,000 in the 1970's to below 280 in 1989, due to poaching.ANTONY NJUGUNA/Reuters

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A new born black rhino and his mother Kalungwizi are shown to the public for the first time at Western Plains Zoo in central New South Wales, June 26, 1996. The mother is one of six black rhino transferred from Zimbabwe to Australia to help the endangered animal breed and is the first to give birt h in the Zoological Parks Board of New South Wales Black Rhinoceros Conservation Program.Mark Baker/Reuters

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A rare and endangered Black Rhinoceros looks up as it eats after being put on public display at Sydney's Taronga Zoo, December 23, 2003. The 11-year-old, 1,300-kilogram male, known as Kwanzaa, is enjoying what is being called a "breeding sabbatical" after travelling from the Western Plains Zoo located in Dubbo. The rhino is part of the two zoo's breeding program for the endangered species, with estimates of surviving numbers in the wild at only 3,200.DAVID GRAY/Reuters

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Kenya Wildlife Service rangers dehorn a black rhino using a chainsaw in the Nairobi National Park June 24, 1996. The rhino was dehorned so it wouldn't injure itself while traveling in a crate. The horn will grow back at a rate of 2 inches a year. Park rangers moved four rhinos on June 20 and four more on June 24 from Nairobi, where the population is booming to Tsavo National Park to rebuild a herd that was nearly wiped out by poachers in the 1980s.The Canadian Press

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