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 bit, either a drill or driverchuck. Hand-operated types are dramatically decreasing in popularity and cordless battery-powered ones proliferating due to ...

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

References

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