Cercocebus sanjei


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Cercocebus sanjei
Species Authority: Mittermeier, 1986
Common Name(s):
English Sanje Mangabey, Sanje River Mangabey, Sanje Crested Mangabey
French Mangabé Sanje
Cercocebus galeritus Mittermeier, 1986 subspecies sanjei
Taxonomic Notes: Grubb et al. (2003) included this species in Cercocebus galeritus, but Groves (2005) and Kingdon (2001) considered it distinct.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii,v) ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Ehardt, C., Butynski, T.M. & Struhsaker, T.
Reviewer(s): Mittermeier, R.A. & Rylands, A.B. (Primate Red List Authority)
Listed as Endangered based on its small extent of occurrence and fragmented population, with a substantial proportion of the population residing in an area of limited protection and where there are ongoing threats resulting in an ongoing decline in habitat and numbers of mature individuals.
2000 Endangered
1996 Endangered
1994 Endangered (Groombridge 1994)
1990 Endangered (IUCN 1990)

Geographic Range [top]

Range Description: This species is known from the region of Mwanihana Forest and Udzwunga Scarp Forest Reserve, on the eastern slopes of the Udzungwa Mountains, Tanzania. It ranges from 400-1,300 m asl.
Tanzania, United Republic of
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population was originally estimated to be between 1,800 and 3,000 animals (Homewood and Rodgers 1981; Rodgers and Homewood 1982; Dinesen et al. 2001). Current population estimate likely does not exceed 1,300 individuals (Ehardt et al. 2005). Split into two distinct subpopulations: the largest subpopulation (ca. 60%) occurs within the recently established Udzungwa Mountains National Park, and the remaining ca. 40% in Udzungwa Scarp Forest Reserve (Ehardt 2001; Ehardt et al. 2005). Until recently, a third subpopulation was believed to exist in Ndundulu Forest Reserve, but surveys in 2004 confirm that the earlier reports by ornithologists (Dinesen et al. 2001) were based on misidentification of the primates present in this Forest Reserve (Ehardt and Butynski 2006).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species is often found in the lower understory of submontane and montane forest, and spends ~50% of its time foraging on the forest floor (Ehardt et al. 2005; Ehardt and Butynski 2006). It frequently moves through and utilizes disturbed areas and mosaic habitat (Ehardt et al. 2005). Diet is strongly concentrated on fruit, nuts and seeds, as well as herbaceous material (Ehardt et al. 2005). Mean group sizes range from 15 to >40 animals (Wasser 1993; Ehardt 2001; Ehardt et al. 2005).
Systems: Terrestrial

Threats [top]

Major Threat(s): It is threatened by continuing deforestation for timber and charcoal production. It is also threatened by hunting, including with dogs.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of CITES and on Class B of the African Convention on the Conservation of Nature and Natural Resources.

It is present in the Udzungwa Mountains National Park and Udzwunga Scarp Forest Reserve, Tanzania (Ehardt et al. 1999; Ehardt 2001; Ehardt et al. 2005; Ehardt and Butynski 2006). Efforts to expand the National Park boundaries to improve the level of protection in the Udzwunga Scarp Forest Reserve have been unsuccessful. Demographic surveys are needed. There is a need to enforce laws prohibiting hunting in forest reserves, and to increase prevention of habitat alteration.

Citation: Ehardt, C., Butynski, T.M. & Struhsaker, T. 2008. Cercocebus sanjei. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 01 April 2015.
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