If you find this page useful please consider making a donation to help us continue to care for needy monkeys. They have been discovered to be genetically distinct from baboons, and more akin to mangabeys. They do share many features with baboons, including, most notably, size. As with most primates, their taxonomy is under dispute. There are two subspecies of drill.
Drills are dark brown with a black face, white tufted beard and scarlet lower lip.
They have a long muzzle with lateral ridges. Their hindquarters is naked and varies in color, which range from bright red, blue, and light purple to lilac and pink. Inner thighs are red. Males are larger and more colorful than females. Their skulls show a marked sexual dimorphism.