The white-naped mangabey is a West African forest monkey marked by a white crown and a dark stripe down its back.
Its coat is brownish gray with a paler chest and belly. The face is gray-pink, with white eyelids and a white crown patch; a black stripe runs down the back.
It eats seeds, fruits, nuts, fungi, and invertebrates. It mainly forages on the forest floor, but also feeds in trees.
An extinction-risk assessment has not been added yet.