One of the largest species in the family Monkey Cercopithecidae. The cheeks are long, dense, and bright, covering the ears, forming the facial disc. At the top of the head the hairs are dark gray or dark gray, forming a "vortex" radiating around almost like a hat. Behind the forehead there is a triangular patch of dark brown hair. The body is covered with long gray hairs. The tail is very short like a pig's tail. Cheeks with pockets, large bottles of buttocks. The tail is usually fat at the base, less than half the length of the body, but 10% longer than the body length and longer than the hind feet.
Foraging during the day, both in open forest valleys on earthy mountains near trees in trees as well as underground. Winter shelter in caves, summer shelter in rocky holes or branches. Herd structure consists of many males and many females. Live in a herd of 10 - 12, with a herd of 40 or more. Sometimes living in small groups of 4 - 5 children. Suitable habitat is primary forest in low belt or secondary forest, wetland forest, dry forest on rocky mountain up to 1700m.
Before 1975, this species was also very popular in forests on an area estimated at> 20,000 km2. From 1975 onwards, the status of the species changed markedly. The number of populations decreased drastically. The current number of sub-populations is about 30. The reason for this change is because the habitat is damaged, the forest is cleared, the natural forest area is narrowed and this is the object of hunting for meat, high cooking, trading. sell and export.