Drill, a West African monkey. The animal weighs up to 60 pounds (28 kg), grows up to 38 inches (95 cm) in height, and has a four-inch (10-cm) tail. The body is covered with dark brown hair, and the face is black with a ring of white hair. Drills have pronounced muzzles with ridges along each side. The buttocks are bare and purplish.

The drill lives on the forest floor and in low trees. It eats foliage, fruit, and insects. The drill is a threatened species because of destruction of its habitat.

The drill is Mandrillus leucophaeus of the Old World monkey family, Cercopithecidae.