The drill (Mandrillus leucophaeus) is a primate of the Cercopithecidae (Old-world Monkeys) family. It is closely related to the baboons and even more closely to the mandrill.
The drill is similar in appearance to the mandrill, but lacks the colorful face. It is found only in Cameroon, Nigeria, and north of the Sanaga River. It is also found on the coastal island of Bioko, part of Equatorial Guinea.
The drill is one of Africa’s most endangered primates.