Large canine teeth (in males these may be over 2 inches long) and a pronounced muzzle characterize these primates. Coat is olive brown, while face has muzzle with red median stripe, and blue ridged sides. These colors are duller in females, along with yellowish-orange coloration around the chin. Rear is blue to reddish-purple. Females weigh 24 to 30 lbs., and males reach weights of up to 110 lbs. The male’s head and body length averages approximately 27.5 inches; tails average 3 to 5 inches long. Females are much smaller than males.