Black-necked cranes fly over a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, March 8, 2025. Photo: Xinhua

A flock of black-necked cranes overwinters at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, March 8, 2025. Photo: Xinhua

A drone photo taken on March 8, 2025 shows black-necked cranes at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region. Photo: Xinhua

A drone photo taken on March 8, 2025 shows a flock of black-necked cranes overwintering at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region. Photo: Xinhua

Black-necked cranes overwinter at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, March 8, 2025. Photo: Xinhua

A flock of black-necked cranes overwinters at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, March 8, 2025. Photo: Xinhua

A flock of black-necked cranes overwinters at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, March 8, 2025. Photo: Xinhua

An aerial drone photo taken on March 8, 2025 shows a flock of black-necked cranes overwintering at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region. Photo: Xinhua