A black-headed gull flies over the Longwangtan Park in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2020. (Xinhua/Zhan Yan)
Bar-headed geese fly over the Longwangtan Park in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2020. (Xinhua/Zhan Yan)
Bar-headed geese fly over the Longwangtan Park in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2020. (Xinhua/Zhan Yan)
Ruddy shelducks are seen at the Longwangtan Park in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2020. (Xinhua/Zhan Yan)
A bar-headed goose is seen at the Longwangtan Park in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2020. (Xinhua/Zhan Yan)