Little information is available on this species’ behaviour and ecology, but what is known about the Malbrouck monkey is that it lives in groups of multiple males and multiple females (5). Females of this species typically remain in the group in which they were born, but males disperse upon reaching maturity (6), and will emigrate to another group to find a mate; this is a risky time as females have been known to aggressively attack transferring males (7). The Malbrouck monkey uses impressive vocal and visual signals to communicate information between group members (5).
Breeding is seasonal and controlled by the dominant male of the group, who uses aggression to scare off any lower-ranking males that try to mate with the higher-ranking females (6). Females usually give birth to a single offspring. Allomothering is common in the Malbrouck monkey, whereby older females care for their younger siblings, enabling them to practice valuable mothering skills. Other members of the group are also on hand to help with rearing the infants (2).
The varied, omnivorous diet of the Malbrouck monkey includes a variety of leaves, gum, nuts, grasses, fungi, fruit, flowers and invertebrates and, less frequently, bird eggs, lizards and rodents (8).