Red-Tailed Monkey

The **red-tailed monkey**, also known as the **black-cheeked white-nosed monkey**, **red-tailed guenon**, **redtail monkey**, or **Schmidt's guenon** (*Cercopithecus ascanius*) is a species of primatein the family Cercopithecidae.

## Appearance

The red-tailed monkey has several different unique features. The species is named for their long red tails, which can measure up to twice the length of the rest of their body. While other subspecies of the red-tailed monkey may have different facial coloring, the Schmidt’s subspecies has a blue-gray face, a white heart-shaped nose, and white cheeks that resemble muttonchops. Their body features a white chest and a gray and red back.

## Distribution and Habitat

The red-tailed monkey is found in Central Africa in the countries of the Democratic Republic of Congo, Uganda, Kenya, Burundi, Zambia, Tanzania, Angola, Cameroon, and Rwanda, with isolated populations in South Sudan and the Central African Republic. They live in a variety of habitats in Sub-Saharan Africa including tropical rainforests, swamplands, and montane forests.

## Diet

A little over half of the red-tailed monkey’s diet is made up of fruit. They have large cheek pouches that can store almost as much food as their stomach. This adaptation allows the monkeys to practice “retrieve-and-retreat” methods during foraging, in which the monkey stuffs his cheeks with as much fruit as possible and then retreats to a secluded location to eat in peace without others trying to steal his food. Red-tailed monkeys may also eat insects, flowers, buds, leaves, and gum.

## Behavior and Lifestyle

Red-tailed monkeys are diurnal and arboreal, although adults will often descend to the forest floor to forage for fallen fruit.

Red-tailed monkeys live in uni-male groups composed of one adult male, about ten females, and their offspring. The females have a dominance hierarchy; one monkey is on top, with her daughters ranking just below her, and with sisters, nieces, and cousins at the bottom of the hierarchy. There are also all-male bands that join female groups during breeding season. There can be a wide range of group sizes, with some groups numbering as high as 50 individuals. Different groups may temporarily join together to forage, which provides them with more protection.

These monkeys awake at sunrise and begin foraging. They spend most of the late morning and afternoon resting, grooming, and traveling, before foraging again in the evening. Studies reveal that red-tailed monkeys prefer to eat fruit in the evening while they forage for leave and bugs in the morning. Activity budgets show that these monkeys spend about 30% of their time foraging, 35% resting and socializing, and 35% traveling.

## Communication

Red-tailed monkeys have several vocal communications including trills to display submissiveness, chirps to identify family members or to sound an alarm, and different types of growls, screams, and hacking calls during fights with other monkeys. They also have a special warning call for birds of prey in which the adults will rapidly shout “ka” until the bird passes by.

A red-tailed monkey looking to intimidate a rival will stare at his target, emphasizing his brightly colored eyelids, open his mouth without showing his teeth, and bob his head up and down. Family members greet each other by rubbing muzzles up against one another.

## Reproduction and Family

Schmidt’s red-tailed monkeys breed year-round, but their peak breeding season occurs between November and February. The single dominant male mates with all of the adult females in the group, but roving bachelor males will sometimes secretly mate with the females. Pregnancy lasts about 6 months, after which a single infant is born, although twins have been observed on very rare occasions.

Females practice allomothering, in which all of the females in the group help raise the offspring. Males reach sexual maturity around the age of 6 and leave their family to join a bachelor group and hopefully someday control a uni-male group of their own. Females are able to mate after 4 or 5 years of life and will likely spend their entire life with their natal group.

## Ecological Role

Red-tailed monkeys are major seed dispersers in their ecosystem. When they eat fruit, they will defecate the seeds far away from their parent tree and allow the new tree to grow without competing with its parent. This ensures a more diverse and healthier ecosystem. Predators of the red-tailed monkeys include chimpanzees, raptors, and leopards.