The Mandrill (Mandrillus sphinx) is a primate of the Cercopithecidae (Old-world monkeys) family, closely related to the baboons and even more closely to the Drill. Both the Mandrill and the Drill were once classified as baboons in genus Papio, but re

The Mandrill is recognized by its olive-colored fur and the colorful face and rump of males, a coloration that grows stronger with sexual maturity; females have duller colours. This coloration becomes more pronounced as the monkey becomes excited and is likely to be an example of sexual selection. The coloration on the rump is thought to enhance visibility in the thick vegetation of the rainforest and aids in group movement. Males average 25–30 kg (55-60 lb), females about half as much (11-14 kg, or 25-30 lb). Unusually large males can weigh 50 kg (110 lb). The average male is 81 cm (32 in) and the female is 56 cm (22 in), with the tail adding another 5–8 cm (2–3 in). They can survive up to 31 years in captivity. Females reach sexual maturity at about 3.5 years.