Yellow-Cheeked Gibbon

The yellow-cheeked gibbon (Nomascus gabriellae)  is a species of gibbon native to Vietnam, Laos, and Cambodia.

also called: the golden-cheeked gibbon, the yellow-cheeked crested gibbon, the golden-cheeked crested gibbon, the red-cheeked gibbon, or the buffed-cheeked gibbon.

Hylobatidae: hylobatus Greek hulobates one who haunts the woods.
Latin name Hylobates: “dweller in the trees”,
Nomascus
Greek nomos ruler
Greek  -nomos -feeding (nemo to feed).