Photo taken on August 18, 2018 shows egrets flying over grassland of Kaishai Island in Nantong, Jiangsu province. [Photo/zgnt.net]

Nantong’s Kaishai Island is one of the most well-preserved primitive ecological environment areas in the lower reaches of the Yangtze River owing to larger areas of wetlands and shoals. It has abundant animal and plant resources, including more than 30 species of waterfowl birds.