Photo taken on Oct. 25, 2019 shows a Hainan gibbon at the Bawangling nature reserve in south China's Hainan Province. (Xinhua/Pu Xiaoxu)

Photo taken on April 3, 2020 shows an Eld's deer at the Bangxi Eld's deer nature reserve in south China's Hainan Province. (Xinhua/Yang Guanyu)

Photo taken on Oct. 26, 2019 shows a crested serpent eagle at the Bawangling nature reserve in south China's Hainan Province. (Xinhua/Pu Xiaoxu)

Aerial photo taken on April 2, 2020 shows the Wuzhishan national nature reserve in south China's Hainan Province. (Xinhua/Yang Guanyu)

Photo taken on Oct. 25, 2019 shows a Hainan gibbon at the Bawangling nature reserve in south China's Hainan Province. (Xinhua/Pu Xiaoxu)

Photo taken on Oct. 26, 2019 shows a Sarcandra glabra at the Bawangling nature reserve in south China's Hainan Province. (Xinhua/Pu Xiaoxu)

Photo taken on April 3, 2020 shows Eld's deers at the Bangxi Eld's deer nature reserve in south China's Hainan Province. (Xinhua/Yang Guanyu)

Aerial photo taken on April 1, 2020 shows the Diaoluoshan national nature reserve in south China's Hainan Province. (Xinhua/Yang Guanyu)

Photo taken on Oct. 26, 2019 shows a Microhyla at the Bawangling nature reserve in south China's Hainan Province. (Xinhua/Pu Xiaoxu)