With the temperature drop, tens of thousands of migratory birds have arrived at Sarah Wusu National Wetland Park in Erdos City, north China's Inner Mongolia Autonomous Region, for the winter.

The park has 8,500 hectares of wetland, but 8,000 square meters of which are not frozen due to underground springs. The unfrozen water is an abundant source of food, like aquatic grasses and fishes, for the birds.

The staff has provided more food for migratory birds to ensure they survive the harsh winter.

There are 15 species of protected birds in the park, including wild ducks, herons, ospreys, and mallards. 

(Cover image via VCG) 

(If you want to contribute and have specific expertise, please contact us at nature@cgtn.com.)