A herd of 15 wild Asian elephants has been wandering across Yunnan province in southern China since March last year. They have trekked more than 300 miles in search of food and a new habitat. CNN's Anna Coren talks to an expert on what this migration means for the species and its survival in China.
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At least a dozen buzzing drones monitor them around the clock. Wherever they go, they're escorted by police. And when they eat or sleep, they're watched by millions online.