Bioko Red-eared Monkey

Vital Stats

  • Latin Name: Cercopithecus erythrotis
  • Bioko's Endemic Subspecies: Cercopithecus erythrotis erythrotis
  • IUCN Status: Vulnerable
  • Captive Population: None, according to ISIS.


Because of its small natural range on the African mainland, the red-eared guenon is one of Africa’s rare monkeys. As of November 2006, there were no red-eared guenons in any of the zoos in the world reporting to ISIS (International Species Information Systems). On Bioko Island, however, it is the most common monkey. It survives in close proximity to humans and thrives in secondary forest. Red-eared guenons live in diffuse groups of approximately ten females and with offspring, often accompanied by at least one adult male. They eat fruits and insects. Red-eared guenons have a brown back and shoulders and a red tail and ears, and gray forearms, hindlegs, hands, and feet. The underside is white. The face is a purplish-blue, with white cheek fur stretching from the nose to either side of the face. Above and below the creamy cheeks are black strips.


Cronin, D. T., D. Bocuma Meñe, T. B. Butynski, J. M. E. Echube, G. W. Hearn, S. Honarvar, J. R. Owens, and C. P. Bohome. 2010. Opportunities Lost: The Rapidly Deteriorating Conservation Status of the Monkeys on Bioko Island, Equatorial Guinea (2010). A Report to the Government of Equatorial Guinea by the Bioko Biodiversity Protection Program, Drexel University, Philadelphia, PA. 40pp.