A gibbon surveyor observes with binoculars in the tropical rainforests on Bawangling Mountain in south China's Hainan Province, Nov. 16, 2020. Known as the world's rarest primates, Hainan gibbons are increasing in number thanks to an improved environment. Latest data from the province's forestry department suggests there are 33 gibbons living in five families, a threefold rise in population from the 1970s. The black-crested apes can only be found in the Bawangling National Nature Reserve on Hainan Island. They live in rainforest trees over 10 meters tall and rarely set foot on the ground, making captive breeding difficult. (Xinhua/Pu Xiaoxu)

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