White-thighed Colobus

The White-thighed Colobus is a striking black-and-white leaf-eating monkey native to the forests of West Africa. It is easily recognized by its long white fur on the thighs and a white facial fringe contrasting with its black body. This species plays an important ecological role as a seed disperser and is critically endangered due to severe habitat loss and hunting pressure.

West Africa, primarily Ghana, Côte d'Ivoire, Togo, and Benin

Found in fragmented forest patches across Ghana, Côte d'Ivoire, Togo, and Benin in West Africa, with the largest remaining populations concentrated in Ghana's forest reserves.

Altitude and depth

Typically found at lowland elevations from near sea level up to approximately 500-800 meters.

Seasonal movements

No true migration or hibernation; activity patterns may shift slightly with wet and dry season fruiting and leafing cycles of forest trees.

Primarily inhabits primary and secondary tropical moist forests, including semi-deciduous and riparian forest fragments; also found in forest-savanna mosaic zones.

Adaptations to its environment

Possesses a specialized multi-chambered stomach with symbiotic bacteria to digest cellulose-rich leaves; long limbs and tail aid in arboreal locomotion and balance while leaping between forest canopy branches.

Critically Endangered (IUCN) due to an estimated population decline exceeding 80% over the past three generations, driven primarily by habitat destruction and hunting.

Estimated population

Population estimated in the low thousands, with a continuing declining trend across its fragmented range.

Severe deforestation for agriculture and logging, habitat fragmentation, and bushmeat hunting are the primary threats; illegal hunting is intensified by the accessibility of remaining small forest fragments.

Diseases and parasites

Susceptible to various gastrointestinal parasites and occasionally affected by disease outbreaks in fragmented, stressed populations.

Protected in several forest reserves in Ghana such as Boabeng-Fiema Monkey Sanctuary and parts of Kakum National Park; listed on CITES Appendix II and covered by national wildlife protection laws in range countries.

Recommended actions

Strengthen enforcement against illegal hunting, expand and connect protected forest fragments, promote community-based conservation initiatives, and conduct further population monitoring.

Predominantly black fur with striking white thigh patches, a white facial ruff, and a long black tail; the fur has a somewhat shaggy texture.

Size

Body length approximately 45-65 cm, with a tail nearly as long or longer than the body (55-80 cm).

Weight

Adults typically weigh between 5-10 kg, with males generally slightly larger than females.

Distinctive features

Distinguished from other colobus species by the specific pattern of white fur restricted to the thighs and face, differing from the fuller white mantle seen in some related species like the King Colobus.

Differences between males and females

Males are moderately larger than females, though pelage coloration is similar between sexes.

Lives in social groups typically composed of 8-20 individuals, often with multiple adult females and one or a few adult males; groups exhibit territorial behavior.

When it is active

Diurnal, with activity concentrated during daylight hours, particularly in early morning and late afternoon for feeding.

Diet

Primarily herbivorous, feeding mainly on young leaves, but also consumes seeds, flowers, and unripe fruits from a variety of forest tree species.

Communication

Communicates through loud vocalizations including roars and barks by males, as well as visual displays and grooming behaviors for social bonding.

Interactions with other species

Natural predators include leopards, eagles, and occasionally chimpanzees; competes with other primate species for forest food resources.

Role in its ecosystem

Acts as an important seed disperser and contributes to forest regeneration through leaf consumption patterns that influence tree community structure.

Breeding is not strictly seasonal; gestation lasts approximately 5-6 months, with females typically giving birth to a single infant.

Raising the young

Infants are cared for primarily by the mother, though allomothering by other females in the group is common; infants are weaned at around 6-12 months of age.

Maturity and lifespan

Sexual maturity is reached around 4-5 years; lifespan in the wild is estimated at 20-25 years, potentially longer in captivity.

Classification

Mammalia > Primates > Cercopithecidae > Colobus > Colobus vellerosus

Scientific synonyms

Colobus polykomos vellerosus (formerly considered a subspecies of Colobus polykomos)

Recent studies

Recent research has focused on population genetics and the effects of habitat fragmentation on group dynamics and long-term viability in Ghana's forest reserves.

Genome and DNA

Diploid chromosome number is 44, consistent with other colobus species; genetic studies have been used to clarify taxonomic boundaries within the Colobus genus.

Compared with similar species

Similar to the King Colobus (Colobus polykomos) but distinguished by the extent and pattern of white fur; historically classified as a subspecies before being recognized as distinct.

This species can leap distances of over 6 meters between trees; males produce loud roaring calls that can be heard over a kilometer away in dense forest.

Where and how to see it

Best observed at dawn in protected areas such as Boabeng-Fiema Monkey Sanctuary in Ghana, where habituated groups can be seen relatively easily.

Risks to humans

No notable risk to humans.

Human uses

Historically hunted for bushmeat and its fur, though such use is now illegal in most range countries due to its critically endangered status.