Life span: 18 years
Total population: Unknown
Regions: Coastal West Africa
Gestation: 167 days
Weight: 10.2 kg (M), 5.5 kg (F)
Species: C. atys
Subspecies: C. a. atys, C. a. lunulatus
Other names: sooty mangabey, white-crowned mangabey, kalalu;
C. a. lunulatus: white-collared mangabey, white-naped mangabey.
Some researchers subsume C. atys under C. torquatus as a
subspecies but due to consistent differences and a geographic separation between
C. torquatus and C. atys populations, C. atys is
elevated to its own species, with the white-naped mangabey
(C. a. lunulatus) as a subspecies (Booth 1956; Groves 2001; 2005).
In this factsheet, unless otherwise specified, "sooty mangabey" refers to members of the species
Photo: Kathelijne Koops
The sooty mangabey is characterized by, and gains its name, from its
pelage color, which
ranges from gray to brown-gray (Groves 2001). The color is somewhat lighter on the
ventral surfaces, sometimes almost appearing light blue, and
is darker on the extremities. The face is grayish-pink with a darker muzzle and ears. (Groves 2001; WS McGraw pers. comm.). The long
cheek whiskers are lighter than the body (Groves 2001). The subspecies C. a. lunulatus has gray-brown
pelage with a white ventral area including inner limbs and
the back of its head is white (Mittermeier et al. 2006). There is a high
level of sexual dimorphism
between males and females (McGraw 1996). Female sooty mangabeys average 5.5 kg
(12.13 lb) and males average 10.2 kg (22.49 lb) (Harvey & Clutton-Brock 1985). The sooty mangabey is somewhat less sexually dimorphic than
Cercocebus torquatus (Groves 2001). Maximum longevity of the sooty mangabey is 18 years
(Harvey & Clutton-Brock 1985).
The species is best described as being primarily
terrestrial (McGraw 1996; 2007a).
The vast majority of sooty mangabey movement is
with over 80% of locomotion being of
this type (McGraw 1998). In addition, over 75% of the sooty mangabey's movement occurs
terrestrially and the remainder is mostly restricted to lower levels of forest strata (McGraw 1998; 2007a).
Climbing and leaping by the sooty mangabey occurs primarily in the
understory, shrub layer
and on the ground (McGraw 1998). During rest periods, the sooty mangabey prefers to seek out something to
sit on, including fallen branches or other items resting on the forest floor, rather
than sitting directly on the ground (McGraw 1996).
CURRENT RANGE MAPS (IUCN REDLIST):Cercocebus atys
The sooty mangabey is found on the west coast of Africa from Senegal to Ghana and in every coastal
country between, including Burkina Faso, Côte d'Ivoire, Guinea, Guinea-Bissau, Liberia, and
Sierra Leone (Struhsaker 1971; Groves 2001; Galat & Galat-Luong 2006). Other researchers place
the range in the rainforests between Guinea and the Sassandra River in the Côte d'Ivoire
(Rödel et al. 2002). Between the two subspecies, the sooty mangabey (C. a. atys) is found west of the Nzo-Sassandra
river while the white-naped mangabey (C. a. lunulatus) is found east of the river (Booth 1956). C. a. lunulatus is found only
east between the Sassandra River in the Côte d'Ivoire and the Volta River in neighboring Ghana
One of the few wild study sites of the sooty mangabey is the Taï National
Park in the Côte d'Ivoire. This national park is the largest and one of the last remaining
primary forests in
West Africa (Range & Noë 2002). Research has been undertaken at the Taï
National Park by Friederike Range, Ronald Noë, and Scott McGraw (McGraw et al. 2007). In 1968 a captive group of
27 sooty mangabeys was established at the Yerkes Regional Primate Research Center in Atlanta,
Georgia where it has expanded and remains under study (Bernstein 1971; Gust & Gordon 1991b).
The main habitat of the sooty mangabey is the West African high forest (Range & Noë 2002).
In the Côte d'Ivoire at the Taï National Park, the sooty mangabey habitat is tropical
moist evergreen rainforest (McGraw 1998; Range & Noë 2002; McGraw et al. 2007). At this location the average
temperature is 24°C (75.2°F) with a pair of dry seasons, one from July to August and
another between November and February (McGraw 1998). The heaviest rainfall totals for the year
occur in September and October (Rödel et al. 2002). Average rainfall at this study site is
1,875 mm (73.82 in) (Range & Noë 2002). Other habitats of the sooty mangabey are
forest and the deciduous
Bissine forest which is dry with a canopy at 15m (49.31 ft) and an open
understory (Struhsaker 1971; Galat & Galat-Luong 2006). The sooty mangabey is capable of living in
both old growth forest and
secondary forest and will
choose either if available (Fimbel 1994). In
addition, farmland is often utilized and inhabited by the sooty mangabey. In Ghana, the species is
most often found in areas with Rhaphia palm swamps and rice farms (Booth 1979).
Sooty mangabeys do most of their moving and foraging on the ground in the forest (McGraw 1998; Rödel et al.
2002). The staples of their diet include fruits, seeds and invertebrates, with seeds making up 68%
of the diet and invertebrates making up 26% (Bergmüller 1998 cited in Rödel et al.
2002; McGraw & Zuberbuhler 2007). Other observations of the species place plants as a far higher proportion of what is eaten at
98.7% and animal foods at only 1.3%. Of the 98.7% plant foods, the vast majority were
fruits with small minorities of leaves, flowers and miscellaneous plant parts. (Booth 1979; Galat & Galat-Luong 1985).
Sooty mangabeys are also regular eaters of frog-spawn
from arboreal clutches surrounding ponds. They know where to look for these clutches of frog eggs
and actively seek them out as a food source (Rödel et al. 2002).
Photo: Yerkes NPRC
Daily, the diurnal sooty
mangabey will divide its activities between feeding, resting, social activities, traveling and
foraging. Of its daily activity budget, feeding takes up 38.8%, rest 18.5%, social
activities 7.9%, travel 10.3%, and foraging 24.5% (McGraw 1998). Sooty mangabey home
range is estimated at 4 to 6 km² (1.54-2.32 mi²) but can be as large as 6.5 km²
(2.5 mi²) (Galat & Galat-Luong 1985; McGraw unpubl. data cited in McGraw & Bshary 2002; McGraw & Zuberbuhler 2007).
Home ranges of sooty mangabey groups are known to overlap extensively in the wild and intergroup
encounters are typified by avoidance, ignorance, or aggressive interactions (Range 2005).
The day range of the sooty mangabey is large (McGraw 1996). In captivity, patterns of daily
activities emerge and are as follows. In the early morning, sooty mangabeys are very active,
displaying, traveling and sexually presenting. Social contact is not prevalent at this time of day.
In the late morning and early afternoon traveling decreases and social contact, grooming and play
are primary activities. By the late afternoon, feeding behavior and play are prevalent with
traveling increasing toward the sunset hours (Bernstein 1976).
Potential predators of the sooty mangabey in the Taï National Park are leopards, crowned hawk
eagles, chimpanzees (Pan troglodytes)
and humans (Zuberbühler et al. 1997; Range & Fischer 2004; McGraw et al. 2006; Shultz et al. 2004; Shultz & Thomsett 2007). Gaboon
vipers as well as leopards and eagles elicit distinct alarm calls from the sooty mangabey (Zuberbühler et al. 1999; Range & Fischer 2004). Red colobus
(Piliocolobus sp.) and Diana
monkeys (Cercopithecus diana)
living in the same habitat as sooty mangabeys will expand their feeding niche when sooty
mangabeys are present. This is presumably due to the ability of terrestrial sooty mangabeys to
identify potential predators and undoubtedly this reduces the threat from ground predators to the
other two species (McGraw & Bshary 2002).
The sooty mangabey often lives in the same habitat of a number of other primate species, although
individual niches within the same habitat are often different. In the Taï Forest in the
Côte d'Ivoire, sooty mangabeys are found with western black and white colobus monkeys
red colobus (Piliocolobus sp.),
olive colobus (Procolobus verus),
Diana monkeys (Cercopithecus diana),
Campbell's guenon (Cercopithecus campbelli)
as well as other primates (McGraw 1998; Refisch & Koné 2005a; McGraw & Zuberbuhler 2007).
The sooty mangabey is used in biomedical AIDS research and is a natural host of
the simian immunodeficiency virus (SIV), the disease from which the human
immunodeficiency virus (HIV) is derived. Because it is a natural host, if
infected with the virus, the sooty mangabey does not get sick and is studied in
the hope that the means by which it remains healthy might be discovered and help
treat or prevent the disease in humans (Silvestri 2005). In addition, sooty
mangabeys are the only species in which naturally occurring leprosy has probably
been transmitted from one monkey to another (Gormus et al. 1988). There is also
evidence for spatial memory among the species, with individuals remembering
which fruit trees which they had previously visited and whether or not the trees
were more likely to carry fruit than others (Janmaat et al. 2006).
Content last modified: December 2, 2008
Written by Kurt Gron. Reviewed by W. Scott McGraw.
Cite this page as:
Gron KJ. 2008 December 2. Primate Factsheets: Sooty mangabey (Cercocebus atys) Taxonomy, Morphology, & Ecology . <http://pin.primate.wisc.edu/factsheets/entry/sooty_mangabey/taxon>. Accessed 2014 September 2.