Once considered a subspecies of the LHoest monkey, it is a mountain dwelling monkey that lives in the forests of eastern Nigeria, western Cameroon and Bioko in Equatorial Guinea. 

While mostly eating fruit insects and leaves, it is known to raid human crops when given the chance.

As with many monkey species, this monkey is endangered as a result of hunting and habitat loss.

There are two subspecies of Preuss’s monkey:

• Cameroon Preuss’s monkey, Cercopithecus preussi preussi
• Bioko Preuss’s monkey, Cercopithecus preussi insularis