yellow-cheeked gibbon, nomascus gabriellae, hanging relaxed in a tree.

adult animal ape arm asia asian black branch buff buffed buffedcheeked cambodia cheek cheeked cheeks climbing crested dark diurnal fauna forest gabriella gabriellae gibbon golden green hanging hylobatidae jungle male mammal monkey nature nomascus primata primate primates simian singapore thai thailand tree tropical vietnam white wild wildlife yellow yellowcheeked zoo