Brown-headed gulls are seen at the Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region, March 30, 2023. (Xinhua/Zhang Rufeng)

This photo taken on March 30, 2023 shows a eurasian coot at the Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

A brown-headed gull flies over the Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region, March 30, 2023. (Xinhua/Zhang Rufeng)

A wild duck is seen at the Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region, March 30, 2023. (Xinhua/Zhang Rufeng)

Bar-headed geese swim at the Lhalu wetland in Lhasa, southwest China's Tibet Autonomous Region, March 30, 2023. (Xinhua/Zhang Rufeng)