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

It is found in Angola, Cameroon, Central African Republic, Democratic Republic of the Congo, Kenya, Rwanda, South Sudan, Tanzania, Uganda, Zambia, and possibly Burundi. The red-tailed monkey is usually black, red, or orange. Although native to this region, it has spread north and south as well as it can survive in different habitats and under different conditions. It is a distinct creature in its habitats and is gradually becoming endangered due to deforestation and over-exploitation through hunting and predation.

Conservation efforts for the red-tailed monkey are of "least concern" as listed by the IUCN Red List of Threatened Species. This has been justified because this species of monkey is located at many different habitats throughout the Congo and throughout East-Central Africa. Also, the species is quite abundant in these areas and they have an average lifespan of about 28 years. The red-tailed monkey is subject to predation by crowned eagles, wild cats, and occasionally, humans and chimpanzees. Despite the influence of predation on their population, no major threat to this species in terms of endangerment is posed, although some locations of their habitat suffer from deforestation and hunting pressure as well. 

This gallery is of Schmidt’s Guenion or Red-tailed Monkey (Cercopithecus ascanius schmidti )and are from Kibale National Park, Uganda. Also from Bigodi Swamp