Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Lian Zhen)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Lian Zhen)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Lian Zhen)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Peng Yuan)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Peng Yuan)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Lian Zhen)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Peng Yuan)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Peng Yuan)
Migrant birds are seen at the Hailiu reservoir in Tumd Left Banner in Hohhot, north China's Inner Mongolia Autonomous Region, Dec. 13, 2021. (Xinhua/Lian Zhen)