Migrant birds seen at Caohai National Nature Reserve in Guizhou

Black-necked cranes and other migrant birds are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Xinhua/Yang Wenbin)

Black-necked cranes are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Xinhua/Yang Wenbin)

Black-necked cranes are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Photo by Luo Dafu/Xinhua)

Black-necked cranes and other migrant birds are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Photo by Luo Dafu/Xinhua)

Black-necked cranes fly in the sky at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Photo by Deng Gang/Xinhua)

Black-necked cranes are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Photo by Deng Gang/Xinhua)

Black-necked cranes and other migrant birds are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Xinhua/Yang Wenbin)

Migrant birds are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Xinhua/Yang Wenbin)

Black-necked cranes and other migrant birds are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Xinhua/Yang Wenbin)

Black-necked cranes and other migrant birds are seen at the Caohai National Nature Reserve in Weining Yi, Hui and Miao Autonomous County, southwest China's Guizhou Province, March 8, 2022. (Xinhua/Yang Wenbin)