Bioko drill

The Bioko drill (Mandrillus leucophaeus poensis) is the subspecies of the drill found only on Bioko Island, Equatorial Guinea, off the west coast of Africa. It is an Old World monkey and one of the largest monkey species, and it is considered endangered. It was cut off from its mainland counterpart when sea levels rose after the last ice age, about 10,000 years ago. It has a green-brown coat, white fur on the underbelly and a yellowish crown of black-tipped fur, where mainland drills have a mostly white crown, and the sexes differ strongly in size: adult males average about 20 kg and females about 8.5 kg. It lives in groups of around 20 to 30, forages mainly on the forest floor, eats fruit, pith, leaves, invertebrates and other items, and disperses seeds. Hunting for the Malabo bushmeat market is the largest threat to its population.