The mandrill (Mandrillus sphinx) is a large Old World monkey native to west-central Africa. It is one of the most colorful mammals in the world and its closest living relative is the drill. Both species were traditionally thought to be baboons, but...
The drill (Mandrillus leucophaeus) is one of Africa’s most endangered mammals. It is related to baboons and even more closely to mandrills.
The Bioko drill (Mandrillus leucophaeus poensis ) is a subspecies of the drill, an Old World monkey. It is endemic to Bioko Island, Equatorial Guinea, located off the west coast of Africa. The drill is one of the largest monkey species, and is...
The mainland drill (Mandrillus leucophaeus leucophaeus ) is a subspecies of the endangered drill. It is distinguished by ringed yellow and black coloring on its crown, and is otherwise similar to the Bioko drill.