Description
English: Plate XXII. Drill Papio leucophæus.
Date 1894
Source Handbook to the Primates, Vol. I. http://archive.org/details/handbooktoprimat01forbiala
Author Henry Ogg Forbes (1851-1932). Species Plates by John Gerrard Keulemans (1842–1912).
Source: https://commons.wikimedia.org/wiki/File:Handbook_to_the_Primates_Plate_22.jpg

The drill (Mandrillus leucophaeus) is a primate of the family Cercopithecidae (Old World monkeys), related to baboons and even more closely to mandrills. Drills are found only in Cross River State in Nigeria, southwestern Cameroon (south to the Sanaga River), and on Bioko Island, part of Equatorial Guinea, in rainforest habitats.