 The species has been found only in higher elevations, above 900m and up to 4600m.In color it is generally dark gray, with a characteristic white stripe which extends from the root of the nose to the upper lip, giving it an owl-like appearance, hence the name "owl-faced monkey".The name "Hamlyn's monkey" and the scientific epithet ""hamlyni"" come from the animal dealer who first brought this species to the London Zoo.