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| Subspecies: | Unknown |
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| Est. World Population: | |
| CITES Status: | NOT LISTED |
| IUCN Status: | Least Concern |
| U.S. ESA Status: | NOT LISTED |
| Body Length: | |
| Tail Length: | |
| Shoulder Height: | |
| Weight: | |
| Top Speed: | |
| Jumping Ability: | (Horizontal) |
| Life Span: | in the Wild |
| Life Span: | in Captivity |
| Sexual Maturity: | (Females) |
| Sexual Maturity: | (Males) |
| Litter Size: | |
| Gestation Period: | |
Aotus nigriceps occurs in lowland tierra firme and seasonally flooded tropical forest. It’s is not restricted to primary forest habitats, being adaptable to modified/disturbed and fragmented habitat.
Aotus are socially monogamous, living in small groups of an adult pair and offspring of different ages (infant, one or two juveniles and sometimes a sub-adult. Both sexes disperse. Males carry and care for the infants (Rotundo et al. 2002, 2005). Lone adults were observed by Villavicencio Galindo (2003) in northern Colombia and in Peru by Shanee et al. (2014). Night monkeys are territorial—groups occupy overlapping territories of 1.3-18 ha (depending on the species and location) (Wright 1978; Fernandez-Duque 2011; Shanee et al. 2014). In Cocha Cashu, Manu National Park, Peru, Wright (1989) recorded home range size for A. nigriceps of 7 to 14 ha. Wright (1994) and Fernandez-Duque (2011) review the behaviour and ecology of the genus.
Diets of night monkeys are variable, A. nigriceps have been observed to consume insects (15% of dietary intake) fruits (75%), leaves and flowers (10%) (Wright 1985, 1994). Arboreal food sources include Moraceze (Ficus spp.). Inga marginata, Annonaceae, Bombacaceaea, Sapindaceae (Wright 1985; Arditi 1992).
Night monkeys reach sexual maturity at 3.3-5 years of age (Fernandez-Duque 2011) and can live for 20 years (Ross 1991; Aquino & Encarnacion 1994). Single offspring are the rule with a 4.5 month gestation period (Wright 1981) and 1 year inter-birth interval (Fernandez-Duque et al. 2008). Wright (1985) recorded births between August and February for A. nigriceps in Peru (Manu National Park), and Aquino et al. (1990) indicated a birth season between December and March for A. nancymaae in north-eastern Peru.
Size:
Adult male weight 0.875 kg (n=1), adult female weight 1.04 kg (n=2) (Smith & Jungers 1997; Peres 1993a).
Aotus nigriceps occurs throughout a large part of the central and upper Amazon, south of the mainstream and along the right bank of the Rio Jutaí in the west. In the east, it extends to the rios Tapajós and Juruena in the south west of Para and north west of Mato Grosso in Brazil (Aotus azarae infulatus occurs to the east of the rios Tapajós and Juruena). It also occurs throughout the state of Rondônia, restricted to east of the Rio Guaporé. In Bolivia, it occurs north of the Río Madre de Dios in the Department of Pando (Hershkovitz 1983; Brown and Rumiz 1986; Anderson 1997), extending to the south-eastern and central Peruvian Amazon, west through the Río Ucayali basin to the Andean foothills west of the Rio Huallaga in San Martin (Shanee et al. 2013; 2015) where it meets the distribution of Aotus miconax (Aquino and Encarnacion 1994a; Shanee et al. 2013; 2015).
The current extent of occurrence for this species in Brazil is estimated at 1,100,650.77 km².
Bolivia
Manuripe National Reserve (Brown and Rumiz 1986)
Brazil
Amazonia National Park (1,114,917 ha) (in range)
Serra do Divisor National Park (846,408 ha)
Juruena National Park
Pacáas Novos National Park
Abufari Biological Reserve (224,819 ha)
Guaporé Biological Reserve (618,173 ha)
Rio Acre Ecological Station (79,418 ha)Cazumbá Iracema Extractive Reserve (750,795 ha) (Oliveira 2012)Chandless State Park (695,303 ha) (Borges 2014)Antimary State Forest (46,596 ha) (Calouro 2005)
Peru
Manu National Park (1,532,806 ha) (Wright 1978, 1985).
It is listed on Appendix II of CITES.