In pics: black-necked cranes in Caohai National Nature Reserve, Guizhou

Photo taken on Jan. 17, 2020 shows black-necked cranes in Caohai National Nature Reserve, Bijie, southwest China's Guizhou Province. The Caohai National Nature Reserve is one of the main places for black-necked cranes overwintering. (Photo by Han Xianpu/Xinhua)