Additionally, the biting and wrestling causes wounding. Fighting often leads to serious injury to one or all contestants and is therefore very costly. For this reason, primates are more likely to rely on threats and displays more often than actual physical combat. The common marmoset, like many other primate species, is not particularly aggressive and fighting is rare. When aggression does occur, it is usually associated with both aggressive and submissive behaviors and vocalizations.
Social grooming is an important form of social contact.
It helps to strengthen and form social bonds among group members and may even be used to ease tense interactions. Common marmosets groom frequently. However, each episode usually lasts for less than one minute. In addition to grooming, other types of social contact are important for common marmosets. They may often be seen nuzzling, hugging, licking or huddling with one another.