Egrets rest in mangrove forest in Dongzhaigang National Nature Reserve in south China's Hainan Province, Oct. 17, 2019. The mangrove area in Dongzhaigang National Nature Reserve has increased from 1,578 hectares in 2001 to 1,771 hectares today. At present, the reserve is rich in biodiversity, with the species and quantities of wildlife continuously increasing. (Xinhua/Yang Guanyu)