Chiropotes albinasus, the White-nosed Saki, is a primate found in Brazil, south of the Amazon river and between the Xingu and Madeira rivers.
Biogeographic Regions: neotropical (Native )
- Grzimek, D. 1977. Grzimek's Animal Life Encyclopedia Volume 10. New York pg.325,333,336: Van Nostrand Reinhold Company.
- Flannery, S. 2000. "Primate Info Net" (On-line). Accessed February 12, 2001 at http://www.primate.wisc.edu/pin/factsheets/chiropotes_albinasus.html.
White-nosed Saki males weigh, on average, 3.1 kg (6.8 lbs), and females weigh 2.5 kg (5.5 lbs). Males are about 42 cm (17 in.) in total length, and females are 38 cm (15 in.) in total length. They have a dark, black coat and a red nose and upper lip which are both covered in white fur. White-nosed Sakis have a long, bushy tail, which they use for balance.
Range mass: 2 to 3 kg.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger
- Nowak, R. 1991. Walker's Mammals of the World Fifth Edition, Volume 1. Baltimore and London pg. 453-457: The Johns Hopkins University Press.
White-nosed Sakis are often found in high forests, flooded forests and far from rivers mainly at the "crown' level of trees. Often sakis are found in dense and moist rainforests. Sakis never use the same sleeping tree for two consecutive nights. (Grizmek 1988; Flannery 2000; Grizmek 1977)
Terrestrial Biomes: forest ; rainforest
Habitat and Ecology
This is a specialized seed predator and a highly frugivorous species, with as much as 90% of the diet composed of fruits (Ayres 1981; Pinto in press). In the Floresta Nacional do Tapajós (Flona Tapajós), immature seeds were the most important food item (48%), followed by mature fruit pulp (39%) and flowers (5%); matures seeds, immature pulp and invertebrates and other dietary items were eaten in smaller quantities. The most important plant families in the diet were Sapotaceae, Lecythidaceae and Moraceae (Pinto in press.). In Aripuanã, Ayres (1981) observed groups with 19 to 26 individuals. A group studied in Flona Tapajós had 56 members and used an estimated area of 1,000 ha in an 11-month study (Pinto, 2008).
The daily diet of White-nosed Sakis is composed primarily of fruit, nuts, and insects. Daily diets vary from area to area and from season to season depending on the availability of different foods. White-nosed Sakis have well-developed teeth to crack nuts for food. They eat rapidly and, as they eat, they are on the lookout for more food. (Grzimek 1977; Nowak 1991; Flannery 2000)
Animal Foods: insects
Plant Foods: seeds, grains, and nuts; fruit
Primary Diet: omnivore
Life History and Behavior
Perception Channels: tactile ; chemical
Status: captivity: 11.7 years.
Status: wild: 17.0 years.
Lifespan, longevity, and ageing
White-nosed Sakis achieve sexual maturity at about the age of four. When in estrus a females' labia changes to bright red, and they walk with their tail raised so that males recognize their condition. White-nosed Sakis give birth to only one young per year. The majority of births occur between February and March and between August and September. Gestation period is about five months. At the age of three months young sakis begin to become more independent from their mothers. (Grzimek 1988; Nowak 1991; Flannery 2000)
Breeding interval: White-nosed sakis breed once per year.
Average number of offspring: 1.
Average gestation period: 5 months.
Range time to independence: 3 (low) months.
Average age at sexual or reproductive maturity (female): 4 years.
Average age at sexual or reproductive maturity (male): 4 years.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; viviparous
Average gestation period: 160 days.
Average number of offspring: 1.
Average age at sexual or reproductive maturity (female)
Sex: female: 1460 days.
White-nosed Sakis are an endangered species due to the destruction of their habitat.
US Federal List: endangered
CITES: appendix i
IUCN Red List of Threatened Species: endangered
IUCN Red List Assessment
Red List Category
Red List Criteria
- 2003Least Concern
- 2003Least Concern(IUCN 2003)
- 1994Vulnerable(Groombridge 1994)
- 1990Vulnerable(IUCN 1990)
- 1988Vulnerable(IUCN Conservation Monitoring Centre 1988)
- 1986Vulnerable(IUCN Conservation Monitoring Centre 1986)
- 1982Vulnerable(Thornback and Jenkins 1982)
Date Listed: 06/02/1970
Lead Region: Foreign (Region 10)
Where Listed: Brazil
Population location: Brazil
Listing status: E
For most current information and documents related to the conservation status and management of Chiropotes albinasus , see its USFWS Species Profile
It is listed on CITES Appendix I.
Relevance to Humans and Ecosystems
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