This monkey lives either in monogamous pairs or in multi-male / multi-female groups of up to 10 (2). Mating occurs during the wet season from September to November in the wild. Females are polyoestrous and have a gestation period of between 145-152 days (3) (2). Single young are usually produced and females have been known to give birth two times a year (5). The mother cares for the infant for the first 10-20 days of its life though after this other members of the group assist in caring for it (3). After seven weeks the juvenile is able to move and forage by itself and sexual maturity is reached at 18-24 months (3).
The diet includes fruits, insects, fungi and some vertebrates (2). It usually forages in the understory of the forest, though it will occasionally travel to the forest floor or higher in the trees to feed (3). Goeldi’s monkey moves with agility through the forest on all fours and is able to leap distances of up to four metres between branches, which is quite spectacular for such a small monkey (3) (5).