When a female is in season, her face and rump turns red. Her rump remains red while she is pregnant and nursing. Females slightly smaller. One young born, rarely twins. Many males and females but with 1 dominant male.
Females form the core and are friendly to each other, sharing baby care.
Family cercopithecidae, subfamily cercopithecinae, genus macaca, fascicularis subgroup. He is assisted by 2-3 male subleaders who maintain order in the group by stopping fights. There is strict hierarchy. After the top few males are the adult females, then juveniles and infants. At the bottom are adult males who are not in control, and they live on the periphery of the troop.