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Africa's poaching problem

Members of the Pilanesberg National Park Anti-Poaching Unit (APU) stand guard as conservationists and police investigate the scene of a rhino poaching incident in South Africa April 19, 2012.

Africa's poaching crisis

Africa's

biggest animals were poached in near record numbers in 2012, with

surging demand for horn and ivory from Asia driving the slaughter of

rhinos and elephants. Poachers have killed hundreds of rhinos in South Africa and thousands of elephants, according to environment ministry figures.