Elephants appear to patrol the Serengeti in this picture taken in Tanzania. A recent study found that ivory-seeking poachers have killed 100,000 African elephants in just three years. During 2011 alone, roughly one of every twelve African elephants was killed by a poacher. Demand for ivory, most notably in China and elsewhere in Asia, has helped keep black market prices high.
(Photograph by: Yaron Shmid, National Geographic)
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