Longevity in the wild is unknown. Monas become sexually mature at around 4 to 5 years. Twins are not uncommon. Births occur at two year intervals and take place at night, in a tree, bringing safety from predators. Newborns are dependent on their mothers for about a month, but by four months are independent and can take care of themselves.
Wild diet consists of fruit, leaves, nuts, grain, roots and wild honey.
In the zoo they are given apples, bananas, vegetables, peanuts and raisins. They also get a high protein primate chow and like a browse of bamboo and banana leaves. Troops of monas are led by one adult male and consist of several females and their offspring. Troop size can range from 3 individuals to as many as 30. There appears to be no ranking order within the troop.