Interactions within the group
Cebus capucinus are very social animals (Long 2012). Due to the danger of predators, C. capucinus travel in groups of about 6 to 30 monkeys. Usually, there are more female capuchins within the group than there are males (Kavanagh 1984). The group of monkeys is led by the dominant males who enforce strict rules within the group (Fobes, King 1982). The female capuchins usually stay in the group that they are born into for their whole life, however the males usually leave the group at the age of four to find a different group.
C. capucinus
are always aware of where the others are and have evolved a system of gestures to communicate with each other (Fobes, King 1982). The C. capucinus have a very advanced system of communication. If there is a predator, one monkey would warn the entire group. They communicate by moving their body certain ways, yelling, touching each other, the smells that they secrete, facial expressions, the noises they make, biting and climbing on one another. For example, if a C. capucinus puckers their lips, it is like blowing a kiss. When trying to impress a female, a male might warble with a high pitch and try to persuade her that he is good enough for her. C. capucinus also have small fingers that are useful for grooming and eating.
During the day, C. capucinus spread out over several hundred meters so that each monkey has room to move around.  At night, they gather in groups of two to four monkeys on a branch in taller trees for protection. C. capucinus are very defensive of their territory and will yell at others when there is an intruder and chase rivals away (Kavanagh 1984).

Interactions with other monkeys
The Cebus capucinus are usually a peaceful group of monkeys (Holloway 1974). The squirrel monkeys often follow the C. capucinus, especially when foraging for food. The C. capucinus stir up insects from little spaces and the squirrel A white-faced capuchin walking through the forestmonkeys follow and eat whatever the C. capucinus do not eat. When casually eating, the C. capucinus will follow the squirrel monkeys. However, when the monkeys were quickly moving to a new place to eat and there was a major movement, the C. capucinus would lead all of the monkeys, including the squirrel monkeys. If a squirrel monkey would run ahead and go a different direction than the C. capucinus, once it realized they were going a different direction, it would turn around and follow the C. capucinus. When feeding, the other monkeys would stop and wait for the C. capucinus, however, when other monkeys were feeding the C. capucinus would keep moving and the other monkeys would have to catch up when they were done feeding (Richard 1985).

Because they are very intelligent, C. capucinus are often hard to catch for predators (Kavanagh 1984). Tree boas, lanceheads and other types of snakes are the most prominent predators for Cebus capucinus. Some other common predators also include caimans, which are a type of alligator, jaguars, ocelots, and large birds, such as harp eagles (Long 2012). The group of capuchins has a specific call for a predator and they usually group together to overcome the predator or run away from it (Kavanagh 1984). Another predator of the C. capucinus is humans. Because C. capucinus are easy to train, many humans catch them and use them for quadriplegic people or for use as street entertainment. The meat of C. capucinus is also a prized item for humans and the monkeys are hunted for that (Rainforest Alliance 2013).

Cebus capucinus
are some of the most intelligent monkeys (Kavanagh 1984).The C. capucinus have developed the ability to be able to use tools to their advantage. For example, they have learned how use sticks and branches to acquire food that they are unable to reach (Schultz 1969). C. capucinus have also learned how to open hard shelled nuts by beating them against a tree or hitting two together to acquire the food inside. C. capucinus that live by the shore gather and eat oysters when there is a low tide and the oysters are easier to obtain (Kavanagh 1984).

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