Red-capped mangabeys live in the dense vegetation of inland swamps, mangroves, and rainforests along the coastal regions of west and central Africa.
These monkeys are primarily frugivorous. Soft and hard fruits comprise most of their diet, but they also eat palm nuts, seeds, young leaves, grass, mushrooms, grubs, insects, bird eggs, and agricultural crops, especially peanuts.
A mangabey’s body length is 18 to 25 inches, with the tail slightly longer at 20 to 31 inches. They weigh 16 to 22 pounds, and males are about 25 percent larger than females. Lifespan in the wild ranges from the late tees to late 20s. In human care they can live up to 35 years. The oldest recorded red-capped mangabey lived much longer: 46 years!