The Vervet monkeys (or “Green monkeys”) live in large groups, which can consist of some males, many females and their offspring and can be as large as 80 animals. The group hierarchy plays an important role: dominant males and females are given priority in the search for food, and are groomed by subordinate members of the group. While young males must leave their group once they are fully mature, females remain and take on the role of their mothers. These monkeys are territorial animals, and a group can occupy an area of approximately 0.1 to 1 km². They use a wide variety of vocalizations, with which they warn off members of other groups from their territory, warn members of the troop of dangers from predators with different calls for different predators. Monkeys scream when disciplined by members of the troop. Facial expressions and body posturing serve as additional communication tools. Their social interactions are highly complex, where alliances can be formed for benefit, deception is used and physical affection is important between family members.