Sadly, In Nigeria, hunters use dogs to pursue drills. They are considered good game as they stand their ground and several can be killed with shotguns before they will flee.

Subspecies
M.l.leucophaeus (mainland), M.l.poensis (Bioke Island).

Life span
Drills can live for over 45 years.

Statistics
Body length: 56-70cm, Tail length: 8-12cm, Weight: 1-17kg.

Physical description
Drills have dark brown fur, with a black face and a white fringe of hair. Their muzzles are long with lateral ridges. Their naked rumps are blue to purple, with red inner thighs.

Distribution
Drills live in Nigeria and Cameroon.

Habitat
Their preferred habitat is lowland rain forest to mountain forest. They have never been observed outside of forests.

Diet
Drills feed on fruits, leaves, roots, seeds, nuts, fruit and invertebrates.

Behaviour
Drills have two group types. One type is made up of 20 females who are led by a single, very large male. The other type is larger, and can include multiple males. During the dry season, many units may join to form troops with as many as 200 individuals. Drills are active during the day. They spend time in the trees, but most of their activity is carried out on the ground.

Reproduction
After a gestation period of 174 days, females give birth to one infant.

Conservation status
Drills are classified as Endangered by the IUCN Red List. They are killed for their meat and for the damage they do to crops.