Males are larger than females, males have a mass of 7 to 9 Kg and females 4 to 5 Kg. The tail is a third longer than the body. The coat of the head and the shoulders is dark grey to black. Facial skin, feet, hands and lower limbs are black. Upper limbs and flanks are paler than the shoulders. Belly and throat are a creamy white. The muzzles of males protrude to accommodate the enlarged canines.