The mainland drill (''Mandrillus leucophaeus leucophaeus'') is a subspecies of the endangered

drill A drill is a tool used for making round holes or driving fasteners. It is fitted with a drill bit for making holes, or a screwdriver bit for securing fasteners. Historically, they were powered by hand, and later mains power, but cordless b ...

. It is distinguished by ringed yellow and black coloring on its crown, and is otherwise similar to the

Bioko drill The Bioko drill (''Mandrillus leucophaeus poensis'') is a subspecies of the Drill (animal), drill, an Old World monkey. It is endemic to Bioko, Bioko Island, Equatorial Guinea, located off the west coast of Africa. The drill is one of the largest ...

References

Mandrillus Primates of Africa Endangered animals Endangered biota of Africa Taxa named by Frédéric Cuvier {{oldworld-monkey-stub