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MASHATU, BOTSWANA - JULY 26: Elephants walk around and eat foliage at the Mashatu game reserve on July 26, 2010 in Mapungubwe, Botswana. Mashatu is a 46,000 hectare reserve located in Eastern Botswana where the Shashe river and Limpopo river meet. (Photo by Cameron Spencer/Getty Images)

MASHATU, BOTSWANA - JULY 26:  Elephants walk around and eat foliage at the Mashatu game reserve on July 26, 2010 in Mapungubwe, Botswana. Mashatu is a 46,000 hectare reserve located in Eastern Botswana where the Shashe river and Limpopo river meet.  (Photo by Cameron Spencer/Getty Images)