The drill (Mandrillus leucophaeus) is a primate of the family Cercopithecidae (Old World monkeys), related to baboons and even more closely to the mandrill.

The drill is a large baboon with a short tail and a dark grey-brown body. This animal is among the most endangered primates in Africa. Drills exhibit well-defined sexual dimorphism with males, being up to twice as large as females. These forest baboons have pink, mauve, and blue rumps.

Drill, (Mandrillus leucophaeus), large short-tailed monkey found from southeastern Nigeria to western Cameroon and on Bioko Island. As a result of hunting and deforestation, the drill is now highly endangered. The drill, like the related mandrill, was formerly thought to be a forest-dwelling.

The Drill is the close cousin of the similar mandrill. The two species share the taxonomic genus Mandrillus. These monkeys have short tails and broad bodies, giving them a baboon-like appearance. You can only find this species in a small region of eastern Africa. Read on to learn about the animal.

Oct 8, 2016 · Drill monkeys are known for being shy, but they have great smiles. They use this smile, known as an “appeasement grin,” to keep the peace when they greet others. Drill monkeys share a colorful...

Oct 14, 2009 · Members of the genus Mandrillus are large-bodied primates that are instantly recognizable. M. sphinx have thick dark gray pelage, banded in black and reddish-yellow, while M. leucophaeus are greenish gray or brown overall with a …

Formally considered “forest-dwelling baboons”, drills (Mandrillus leucophaeus) have been observed by scientists on Africa’s mainland since 1962, and on Bioko since 1990 when Gail Hean visited the island with two primatologists.

Drills have distinct ridges on the side of their nasal bones, which are caused by outgrowth of the ridged and grooved bone. Male drills are easily distinguished from male mandrills by the absence of brightly colored facial skin, and the absence of prominent grooves in the facial ridges.