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| Mandrillus sphinx|
The Mandrill (Mandrillus sphinx) are the wold's largest monkeys. They are also the most colourful primates. The skin colours brighten as the animal gets more excited. Males live mostly on the forest floor, while females and young climb up into trees and bushes.
Males have an orange/yellow beard and an unmistakable bright red and blue snout and rump. Females and juveniles have a duller blue snout and a buff beard. Mandrills can live for 31 years in captivity. They feed on fruits, leaves, roots, seeds, nuts, greens and invertebrates.
Mandrills seem to live in large, stable groups called "hordes". Hordes often number in the hundreds, possibly averaging around 620 individuals and reaching as many as 845. It is difficult to accurately estimate group size in the forest, but filming a group crossing a gap between two forest patches or crossing a road is a reliable way of estimating group size. The largest group verifiably observed in this way contained over 1,300 individuals, in Lopé National Park, Gabon—the largest aggregation of nonhuman primates ever recorded. These groups are made of adult females and their dependent offspring.
- Sabater Pí, J 1972. Contribution to the ecology of Mandrillus sphinx Linnaeus 1758 of Rio Muni (Republic of Equatorial Guinea). Folia primatologica; international journal of primatology 17 (4): 304–19. 
- Rogers M.E. 1996. Ten days in the life of a Mandrill horde in the Lopé Reserve, Gabon. American Journal of Primatology 40 (4): 297.
- "Gabon". Wildlife Conservation Society. http://www.wcs.org/where-we-work/africa/gabon.aspx. Retrieved 4 February 2012.
- Abernethy KA, White LJT, Wickings EJ (2002). "Hordes of mandrills (Mandrillus sphinx)". Journal of Zoology 258: 131. .
- Harrison MJS 2009. The mandrill in Gabon's rain forest-ecology, distribution and status. Oryx 22 (4): 218.