A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

The first rays of sunlight in the morning shine on a resting flock of black-necked cranes overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A drone photo shows a resting flock of black-necked cranes near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A drone photo shows a resting flock of black-necked cranes near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A resting flock of black-necked cranes is pictured near a reservoir, overwintering in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)

A drone photo shows a flock of bar-headed geese and yellow ducks flying over a resting flock of black-necked cranes in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region, Feb. 20, 2025. (Xinhua/Jigme Dorje)