Thick rain forest.
Mandrills are the most brightly colored mammals in existences.
They spend the majority of their time on the ground searching for food, but move to trees to eat and sleep. Prominent ridges are located on each side of the nasal bones and there are six grooves in each ridge. The adult male has blue and purple in these grooves and a scarlet nose. Females and the young males have less pronounced grooves, no purple coloration and a black nose. Presenting the buttocks is a sign of submission not only for the mandrill, but also for many Old World monkeys.