Any of several long-tailed arboreal African monkeys, of the genera Cercopithecus and Erythrocebus (formerly classified as Cercocebus), such as as the green monkey (Cercopithecus callitrichus) and grivet (Cercopithecus griseo-viridis).

( Cercopithecus spp.) A genus of small-sized monkeys found in Africa. They live in trees and eat invertebrates, plant parts, and fruit. Many guenons are threatened or endangered due to habitat destruction, hunting, and a restricted geographical distribution. Guenon comes from the French word, meaning fright, because they grimace and expose teeth when they are excited or angry.

small slender African monkey having long hind limbs and tail and long hair around the face