This photo taken on Dec. 16, 2024 shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

This photo taken on Dec. 16, 2024 shows ruddy shelduck at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Photo by Shen Guangyong/Xinhua)

This photo taken on Dec. 16, 2024 shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

This photo taken on Dec. 16, 2024 shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Photo by Shen Guangyong/Xinhua)

This photo taken on Dec. 16, 2024 shows wintering migratory birds at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

This photo taken on Dec. 16, 2024 shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

An aerial drone photo shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province, Dec. 16, 2024. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Photo by Wang Chunliang/Xinhua)

This photo taken on Dec. 16, 2024 shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

This photo taken on Dec. 16, 2024 shows wintering migratory birds at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

This photo taken on Dec. 16, 2024 shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

This photo taken on Dec. 16, 2024 shows black-necked cranes and bar-headed geese at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

An aerial drone photo shows black-necked cranes at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province, Dec. 16, 2024. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Photo by Wang Chunliang/Xinhua)

This photo taken on Dec. 16, 2024 shows bar-headed geese at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)

An aerial drone photo shows wintering birds at Caohai National Nature Reserve in the Yi-Hui-Miao Autonomous County of Weining, southwest China's Guizhou Province, Dec. 16, 2024. Caohai National Nature Reserve is an important wintering ground for black-necked cranes. In recent years, the population of wintering black-necked cranes has increased, thanks to the local authorities' efforts in ecosystem restoration and patrolling.

Currently, the reserve is home to nearly 100,000 wintering migratory birds, including 2,500-plus black-necked cranes as well as other species such as grey cranes and bar-headed geese. (Xinhua/Yang Wenbin)