Drill (Mandrillus leucophaeus). A diurnal monkey living in coastal forests of southeastern Nigeria, western Cameroon and Equatorial Guinea. Males are much larger, weighing about 25 kg, while females weigh about 11 kg. They primarily eat fruit, seeds, flowers and leaves, and can store food in cheek pouches. Highly terrestrial, they move on all fours, form troops of about 20–25 individuals, and communicate and mark territory with scent from their scent glands. Populations have declined due to hunting and habitat destruction, and the species is classified as Endangered (IUCN Category I B).