WEINING, Nov. 30, 2018 - Black-necked cranes fly over the Caohai National Nature Reserve in Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province, Nov. 29, 2018. Thousands of black-necked cranes have arrived here to spend the winter time.

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Black-necked cranes are seen at the Caohai National Nature Reserve in Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province, Nov. 29, 2018.

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