CHANG TANG NATURE RESERVE, July 3, 2014 (Xinhua) -- Photo taken on June 27, 2014 shows wild yaks at Chang Tang Nature Reserve, southwest China's Tibet Autonomous Region. Thanks to preservation measures, the number of wild yaks at the Chang Tang Nature Reserve has climbed to more than 60,000, a sharp contrast with 6,000-odd as compared to 20 years ago.

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