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In December, nine elephants were killed outside the Tsavo National Park, in south-eastern Kenya.
BBC: African elephant poaching threatens wildlife future
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After this, they gave semi-wild elephants in a rehabilitation centre in Tsavo National Park four types of branches.
BBC: Ants work with acacia trees to prevent elephant damage
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Saturday's killings took place in Tsavo National Park, Kenya's largest single continuous ecosystem, which is home to some 13, 000 elephants.
BBC: Kenya hunts ivory poachers after elephant family killed
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Last weekend three park rangers and four suspected poachers were killed in a shootout in the Tsavo East National Park, close to the Somali border, where illegal killings have risen from four in 2003 to 14 last year.
CNN: Elephants at risk from gangs, eBay
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Established in 1977, the inner-city shelter was set up for orphaned pachyderms and rhinos by David Shekdrick, the former head warden of Tsavo East National Park, and his wife Dame Daphne, a long-standing conservation campaigner.
BBC: The wildest side of Nairobi