FILE - In this undated file photo released by the Communication and Liaison Services of the Office of the South African National Commissioner, the corpse of a slaughtered Rhino lays on the ground in a national park in South Africa. Experts say Vietnam's surging demand of rhino horn is threatening to wipe out the world's remaining rhinoceros populations, which recovered from the brink of extinction after the 1970s thanks to conservation campaigns. Illegal killings in Africa hit the highest recorded level in 2011 and are expected to worsen this year. The photo was released when South African police and game park rangers announced Jan. 16, 2009 they have arrested 11 suspects in an international rhinoceros poaching ring. (AP Photo/South African Communication and Liaison Services of the Office of the National Commissioner, File) NO SALES

Associated Press
FILE - In this undated file photo released by the Communication and Liaison Services of the Office of the South African National Commissioner, the corpse of a slaughtered Rhino lays on the ground in a national park in South Africa. Experts say Vietnam's surging demand of rhino horn is threatening to wipe out the world's remaining rhinoceros populations, which recovered from the brink of extinction after the 1970s thanks to conservation campaigns. Illegal killings in Africa hit the highest recorded level in 2011 and are expected to worsen this year. The photo was released when South African police and game park rangers announced Jan. 16, 2009 they have arrested 11 suspects in an international rhinoceros poaching ring. (AP Photo/South African Communication and Liaison Services of the Office of the National Commissioner, File) NO SALES
FILE - In this undated file photo released by the Communication and Liaison Services of the Office of the South African National Commissioner, the corpse of a slaughtered Rhino lays on the ground in a national park in South Africa. Experts say Vietnam's surging demand of rhino horn is threatening to wipe out the world's remaining rhinoceros populations, which recovered from the brink of extinction after the 1970s thanks to conservation campaigns. Illegal killings in Africa hit the highest recorded level in 2011 and are expected to worsen this year. The photo was released when South African police and game park rangers announced Jan. 16, 2009 they have arrested 11 suspects in an international rhinoceros poaching ring. (AP Photo/South African Communication and Liaison Services of the Office of the National Commissioner, File) NO SALES
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