Monkeys who use the call include Japanese macaques, rhesus macaques, mandrills, and baboons. Chimpanzees, gorillas, orangutans, capuchin monkeys, baboons, and mandrills have all been reported as using tools. Angolan colobus monkeys, guenon, marmosets and mandrills also call this area home. Eagles, bonobos and mandrills may also prey on the bay duiker. Mandrills are preyed on mainly by leopards. Mandrills are found in southern Cameroon, Gabon, Equatorial Guinea, and Congo. Mandrills are the world's largest monkeys. Mandrills are particularly threatened in the Republic of the Congo. Lions have their own enclosure, as do the mandrills. Mandrills have an omnivorous diet consisting mostly of fruits and insects. Mandrills will cross grass areas within their forest habitats. Mandrills mostly live in tropical rainforest and in very large groups. In the wild, males disperse and only female mandrills remain in their birth group. The Toronto Zoo no longer displays mandrills. Mandrills can live up to 31 years in captivity.