Black-necked cranes are seen in the Linzhou County, southwest China's Tibet Autonomous Region, Jan. 9, 2015. The number of black-necked cranes, the first-level state protected wildlife, has kept rising in the past years thanks to a series of protection measures taken in Tibet. (Xinhua/Purbu Zhaxi)

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Black-necked cranes are seen in the Linzhou County, southwest China's Tibet Autonomous Region, Jan. 9, 2015. The number of black-necked cranes, the first-level state protected wildlife, has kept rising in the past years thanks to a series of protection measures taken in Tibet. (Xinhua/Purbu Zhaxi)

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Black-necked cranes are seen in the Linzhou County, southwest China's Tibet Autonomous Region, Jan. 9, 2015. The number of black-necked cranes, the first-level state protected wildlife, has kept rising in the past years thanks to a series of protection measures taken in Tibet. (Xinhua/Purbu Zhaxi)\

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Black-necked cranes are seen in the Linzhou County, southwest China's Tibet Autonomous Region, Jan. 9, 2015. The number of black-necked cranes, the first-level state protected wildlife, has kept rising in the past years thanks to a series of protection measures taken in Tibet. (Xinhua/Purbu Zhaxi)

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Black-necked cranes are seen in the Linzhou County, southwest China's Tibet Autonomous Region, Jan. 9, 2015. The number of black-necked cranes, the first-level state protected wildlife, has kept rising in the past years thanks to a series of protection measures taken in Tibet. (Xinhua/Purbu Zhaxi)