Thus, they are slender and long with well-developed tails. They move on all fours holding their tails erect or curved over the back. Another unique mangabey feature is their white eyelids. Male 11-14kg, some can reach 20kg. Female 6-8 kg.
Females form the core, led by a dominant female.
1 or more males may associate with the group. Mangabeys belong to the family cercopithicidae. There are 4-9 species, taxonomic disputes continue. Although they look similar, the mangabey species have different behaviour and take up different niches. The last two are sometimes assigned the genus Lophocebus instead.