Hidden in the depth of Mount Bawangling in south China's Hainan Province, a group of black-crested gibbons have been living there care-free as one of the oldest residents in the forest. In order to survive in the wild, these gibbons have gradually become kung fu masters by flying and hopping on the branches all day.

(If you want to contribute and have specific expertise, please contact us at nature@cgtn.com.)