[2] Campbell's mona monkey is native to Senegal, Gambia, Guinea-Bissau, Guinea, Sierra Leone and Liberia as far east as the Cavally River on the border with Ivory Coast, and also the island of Caravela, off Guinea Bissau.

[2] Campbell's mona monkey is a sociable and territorial species, living in small groups of about eight individuals.

Around dawn and dusk, the dominant male climbs to a perch on an emergent tree and issues a series of booms.

[4] This species has one of the more advanced forms of animal communication, with a rudimentary syntax.

The greater part of its diet is wild and cultivated fruit, but it also eats seeds, invertebrates, grubs, small amphibians and lizards.