They are native to Brazil, Colombia, Ecuador, Guyana, Surinam and Venezuela. They move around on all fours, whether walking or running. They spend three quarters of the day looking for insects and other small prey to eat.
In the dry seasons, when there is no fruit, they are capable of surviving just on animal prey. They live in groups with a lot of males, and these groups can be quite large with up to 100 individuals. The hierarchy tends to be linear and the males are more dominant than the females. Aggression between females is rare, whilst males tend for form alliances and they can fight each other.
The males tend to keep watch for the presence of predators. Mating and birth are both highly seasonal activities, and rarely last more than two months.
They give birth to one sole baby. Births tend to occur every two years. This species tends to associate with other species of monkey of their own genus and of the Cebus genus and they make use of the din made by Capuchin monkeys in the treetops, as they startle insects in their wake.
Although they are not frequently hunted due to their small size, they are hunted for pets in some countries such as Colombia or Ecuador.