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Black-necked cranes fly over the Caohai national nature reserve in southwest China's Guizhou Province, March 9, 2018. Migratory birds began to fly northbound after wintering in Caohai. (Xinhua/He Huan)
Black-necked cranes fly over the Caohai national nature reserve in southwest China's Guizhou Province, March 9, 2018. Migratory birds began to fly northbound after wintering in Caohai. (Xinhua/He Huan)