Dusky titi monkeys live in pairs. The bond between the male and female is very strong, and when they have been separated in captivity, they both become highly stressed.

Subspecies
Disputed, as several former subspecies are now considered separate species.

Life span
Over 12 years.

Statistics
Head and body length: Female: 29-42cm, Male: 30-45cm. Tail length: Female: 36-64cm, Male: 39-50cm. Weight: Female: 700-1020g, Male: 800-1200g.

Physical description
Dusky titi monkeys have a grey to red/brown coat, with a long tail. The under-parts, inner limbs and sideburns are orange and their face-markings are sometimes a strikingly different colour.

Distribution
Dusky titi monkey inhabit South America, including Brazil, Bolivia, Peru, Venezuela and Colombia.

Habitat
They are found in wet or inundated forests, especially in dense underbrush, and in gallery forests.

Diet
Most of their diet consists of fruit, but they also feed on small animals, insects, spiders and leaves.

Behaviour
Dusky titi monkeys are found in male-female pairs or small family groups (parents and 2-3 young). They are diurnal and arboreal. Both sexes vocalise synchronously early in the morning, probably to announce their presence in their territory. They have a home range of around 6-12 ha. They move through the forest quadrupedally and by leaping.

Reproduction
Dusky titi monkeys mate for life. After a gestation period of 155 days, the female gives birth to just one infant. The bond between the male and the infant is very strong, and the male carries the baby for most of the time as well as grooming, playing, and sharing food with the infant.

Conservation status
Dusky titi monkeys are not on the 2000 IUCN Red List.