Aotus trivirgatus (Humboldt, 1812)

Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson, 2013, Aotidae, Handbook of the Mammals of the World – Volume 3 Primates, Barcelona: Lynx Edicions, pp. 414-431 : 428

publication ID 10.5281/zenodo.5726960


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scientific name

Aotus trivirgatus


5 View On . Humboldt’s Night Monkey Aotus trivirgatus View in CoL

French: Douroucouli de Humboldt / German: Ostlicher Graukehl-Nachtaffe / Spanish: Mico nocturno de Humboldt Other common names: Douroucouli, Northern Gray-necked Owl Monkey, Northern Night Monkey, Three-striped Night Monkey, Three-striped Owl Monkey

Taxonomy. Simia trivirgatus Humboldt, 1812 ,

Forests of the Rio Cassiquiare, near the foot of Mount Duida, Amazonas, Venezuela .

Undal the revision by P. Hershkovitz in 1983, the genus was considered to be monotypic, with A. trivirgatus as the only species. In his catalogue published in 1957, A. Cabrera listed nine subspecies, and W. C. O. Hill in his review of 1960 listed ten. Many of these are now considered distinct species. Some publications up to the 1980s and early 1990sstill referred to all night monkeys as belonging to this one species. Monotypic.

Distribution. N Brazil (N of the rios Negro and Amazonas and W of the Rio Trombetas), SC Venezuela (N to middle Orinoco E at least as far as the Rio Caura) and E Colombia (T. Defler reports sightings from the middle Rio Caqueta above the mouth of the Miriti-Parana and the lower Rio Inirida to the N); as such, Humboldt’s Night Monkey may be sympatric with Spix’s Night Monkey (A. vociferans ) in some parts of Colombia. View Figure

Descriptive notes. Head-body 30-38 cm,tail 33-40 cm; weight ¢.813 g (males) and c.736 g (females). Humboldt’s Night Monkey is a gray-necked species. The hair on the side of the neck is grayish-agouti to mainly brownish agouti. Upperparts of the body are grayish to buffy-agouti. Innersides of the limbs, extending to the wrists and ankle, are similar in colorto the orange-buffy of the chest and belly. The facial pattern is quite inconspicuous, triradiate stripes are brown, and the face is rather grayish compared with the usual white of other night monkeys. Hands and feet are dark brown. Humboldt’s Night Monkey can be distinguished from other night monkeys by its parallel temporal stripes and the lack of an interscapular whorl or crest.

Habitat. Tropical forests, including dry forest.

Food and Feeding. There is no information available for this species.

Breeding. There is no information available for this species.

Activity patterns. Humboldt’s Night Monkey is nocturnal and arboreal. Climbing, leaping, and quadrupedal and suspensory locomotion have been reported.

Movements, Home range and Social organization. Similar to all the night monkeys, Humboldt’s Night Monkey is monogamous, with the male carrying and provisioning young. A home range of size of 3-1 ha and a mean night range of 252 m have been reported, but these numbers are based on data from a single group.

Status and Conservation. CITES Appendix II. Classified as Least Concern on The IUCN Red List. Humboldt’s Night Monkey is a wide-ranging species and generally not hunted. There are a number of protected areas within its range: Pico da Neblina National Park, biological reserves of Rio Trombetas and Uatuma, and ecological stations of Anavilhanas, Caracarai, and Niquia in Brazil and national parks ofJaua-Sarisarinama, Parima-Tapirapeco, Duida-Marahuaca, and Yapacana in southern Venezuela.

Bibliography. Bodini & Pérez-Hernandez (1987), Brumback (1973, 1974, 1975b), Brumback et al. (1971), Cabrera (1957), Cicmanec & Campbell (1977), Defler (2003b, 2004), Dixson (1982, 1983), Egozcue (1971), Erkert (1976), Fernandes (1993), Fernandez-Duque (2011a, 2012), Ford (1994a, 1994b), Hanson & Montagna (1962), Hershkovitz (1983), Hill (1960), Linares (1998), Napier (1976), Smith & Jungers (1997), Sussman & Phillips-Conroy (1995), Torres et al. (1998), Wright (1978, 1981, 1984, 1990), Yunis et al. (1977), Zito et al. (2003).














Aotus trivirgatus

Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson 2013

Simia trivirgatus

Humboldt 1812
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