Birds seen at Yellow River's middle reaches in Inner Mongolia(1/4)

Birds fly over the Yellow River's middle reaches in Dalad Banner of Erdos, north China's Inner Mongolia Autonomous Region, Nov. 27, 2021. (Xinhua/Jia Lijun)

Birds perch on flowing ice at the Yellow River's middle reaches in Dalad Banner of Erdos, north China's Inner Mongolia Autonomous Region, Nov. 27, 2021. (Xinhua/Jia Lijun)

Birds perch on flowing ice at the Yellow River's middle reaches in Dalad Banner of Erdos, north China's Inner Mongolia Autonomous Region, Nov. 27, 2021. (Xinhua/Jia Lijun)

Birds fly over the Yellow River's middle reaches in Dalad Banner of Erdos, north China's Inner Mongolia Autonomous Region, Nov. 28, 2021. (Xinhua/Jia Lijun)