Black-necked cranes and some migrant birds are seen at the National Nature Reserve of Black Necked Cranes in Huize County of Qujing City, southwest China's Yunnan Province, March 2, 2018. Each year a good many black-necked cranes and other migrant birds chose to spend winter on the wetlands at the reserve here due to its sound environment. (Xinhua/Hu Chao)