They have a brown coat speckled with grey which becomes black on its lower arms and legs and on the base of its long tail.

Around the face the fur is yellow marked with a wide black stripes which runs from the beside the eyes over to the temples and across the centre of the forehead where it forms the characteristic small crest which gives this species its common name.

[4] The Crested mona monkey occurs in mature lowland rainforest, in both primary and secondary forest, where there is a well developed canopy and with a clear understorey.

Groups are highly vocal, with the males producing the loud, "boom" mentioned above announcing their presence and status, there is also a sharp hacking call which is used as an alarm.

Unlike most guenons, populations of the crested mona monkey in the northern parts of its range are known to migrate over long distances to forage for seasonally abundant food supplies.

Breeding seem to take place at any time of year, and the females give birth to a single baby after a gestation period of roughly five months.