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Rhino horn 2011 11 04

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US rhino horn smuggling ring cracked, with arrests in four states under 'Operation Crash'
The ring smuggled rhino horns from the US to China and Vietnam.
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Asian rhino horn mania drives extinction
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Rhino horn 2011 11 04

Two male rhinos lock horns playfully while pasturing in the savanah at the Lewa Wildlife Conservancy in Kenya.

ROBERTO SCHMIDT
AFP/Getty Images