A grey heron and egrets are seen on the beach of the Shenzhen Bay in Shenzhen, south China's Guangdong Province, Nov. 9, 2017. Along the coastal areas of the Shenzhen Bay, a mangrove forest is the habitat for about 100,000 migratory birds of 40 species, some of which are endangered. (Xinhua/Mao Siqian)