Flocks of migrant birds fly over the coast of Rudong county, Nantong, East China's Jiangsu province, on Nov 10. Rudong boasts a natural wetland of more than 66,700 hectares in its coastal area, attracting millions of migrant birds every spring and autumn. [Photo/VCG]

Migrant birds land on the coast of Rudong county to rest and eat, Nov 10. More than 300 species of wild bird are known to stopover in Rudong. [Photo/VCG]

Wild birds rest in a wetland in Rudong, Nov 10. [Photo/VCG]