The Preuss's monkey (Cercopithecus preussi), also known as Preuss's guenon, is a diurnal primate that lives terrestrially in mountainous (up to 2500 m) forests of eastern Nigeria, western Cameroon and Bioko in Equatorial Guinea. It is sometimes classified as a subspecies of the L'Hoest's monkey (C. lhoesti).
The diet of Preuss's monkey is primarily fruit, leaves and insects, although the species occasionally raids human crops. It is darkish in coloration with a white chin, and adult males have a blue scrotum. Preuss's monkeys weigh up to 10 kg. Troops consist of one adult male and several females and adolescents, averaging 17 total per troop. Females give birth to a single offspring about once every three years. The young mature at 4 years and live to be an average of 31 years.
Preuss's monkey is known to occur in captivity only at the Centre for Education, Rehabilitation, and Conservation of Primates and Nature (CERCOPAN) in Cross River State, Nigeria.
There are two subspecies of Preuss's monkey:
- Cameroon Preuss's monkey, Cercopithecus preussi preussi
- Bioko Preuss's monkey, Cercopithecus preussi insularis
- Groves, C.P. (2005). Wilson, D.E.; Reeder, D.M., eds. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 158. ISBN 0-801-88221-4. OCLC 62265494.
- Oates, J. F. (2016). "Allochrocebus preussi". The IUCN Red List of Threatened Species. IUCN. 2016: e.T4227A92346191. doi:10.2305/IUCN.UK.2016-1.RLTS.T4227A92346191.en. Retrieved 12 January 2018.
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