From late November 2021 to early December 2021, the Hainan Institute of National Park (HINP) conducted field research in and around the five family groups (group A - E) of gibbons in the reserve with the participation of relevant experts and staff from the Bawangling Reserve. The research has set up 8 stationed sites and 21 surveillance sites, covering the habitat of each Hainan gibbon population, with 48 team members participating simultaneously.