(See P.-F. Fan et al., “Description of a new species of Hoolock gibbon (Primates: Hylobatidae) based on integrative taxonomy,” American Journal of Primatology, doi:10.1002/ajp.22631, 2017)
(See A. Estrada et al., “Impending extinction crisis of the world’s primates: Why primates matter,” Science Advances, doi:10.1126/sciadv.1600946, 2017)