| Latin name | ercopithicus aethiops sp |
| Length | 325-700mm |
| Weight | 5-9kg |
| Gestation | 163 days |
| No. of young | usually one, occasionally twins |
| Lifespan | up to 33 years in captivity |
Found throughout many different countries in Africa. They are highly adaptable and live in forests, woodlands and savannah usually near rivers and streams.
Fruit, leaves, grain and roots. Occasionally young birds, birds eggs, small reptiles and insects which provide an additional source of protein.
Population thought to be declining because of destruction of forest habitat.
- Common name is Guenon from the french word meaning fright. This refers to the fact that grass monkeys expose their teeth and grimace when excited or angry.
- Grass monkeys are good swimmers and can descend trees headfirst