Mandrills (Mandrillus sphinx) are primates closely related to baboons. They have long arms that are used for walking on the ground and travelling long distances. Mandrills are large monkeys with distinctive colorful patterns on several parts of their bodies.
The Secret Behind Mandrill’s Colorful Face
Male mandrills have striking facial colors, bright blue and red or pink, that indicate high testosterone levels and good physical condition.
The blue color comes from collagen structures beneath the skin that refract light, while the red is produced by blood vessels. The more intense the colors, the more intimidating they appear to rivals and more attractive they are to females, as these traits signal strong genetic quality. Additionally, these bright colors help them recognize each other and communicate in dense forests.
Social Structure and Power Struggles
Mandrills live in large groups called hordes, consisting of dozens to hundreds of individuals. These groups are typically led by a dominant male (alpha)., who has a larger body size and more striking facial and rump coloration.
The group hierarchy is linear and competitive, especially among males. Males compete through fights or visual displays to achieve dominant status, which strongly influences their reproductive success.
In contrast, females have a more stable social system. They form matrilineal groups and usually remain in their natal group for life, while males tend to leave the group upon reaching adulthood.
Diet and Foraging Behavior
Mandrills are omnivorous primates with a highly varied diet. They are opportunistic feeders, meaning they eat whatever is available in their environment.
As semi-terrestrial animals, mandrills spend most of their time foraging on the forest floor, with about 70-76% of their food coming from the ground. However, they are also skilled climbers, ascending trees to find fruits and seeds, and sleeping on high branches to avoid predators.
Unique Communication of Mandrills
Mandrills communicate through facial expressions, vocalizations, and body language to regulate their social structure. They bare their teeth in a grin as a sign of friendliness, stare with an open mouth as a threat, purse their lips to show submission or anxiety, and keep their mouth relaxed and open as an invitation to play.
They also use vocalizations, such as grunts to maintain group contact, long distance calls for communication, and loud, high pitched bark as warnings of danger or signs of aggression.
In terms of body language, mandrills slap the ground when angry or asserting dominance, turn their faces away to avoid interaction, and display their rump as a sign of submission.