Feeding at night, the Colombian night monkey avoids potential daytime predators such as cats and birds, while also minimising competition with diurnal foragers (4). During the day it sleeps in dense brush, vines or hollow trees (6), leaving its resting place promptly after sunset to feed. It moves along the branches and between trees and is capable of making huge leaps, three to five metres across gaps in the canopy (4).The Colombian night monkey’s diet consists mainly of fruit, leaves and nectar, but it will also supplement this with small animals such as insects (1).
This species is monogamous and is usually found in small family groups of between two and five individuals, comprising a male and female pair and their offspring (1). A territorial species, each group defends an area of approximately 5 to 18 hectares (1). After a gestation period of 133 days, the female gives birth to a single infant or occasionally twins (3). Unusually for a mammal, the male is the main carer, carrying the infant from the second week after birth until the eighteenth week, when the infant will move independently; the infant will only return to the female for milk. After 2.5 to 3.5 years the young will reach sexual maturity and disperse (8).