Most primates live in groups. Despite the advantages, this type of social organization can also increase competition for resources intragroup. The priority access to these resources is linked to dominance hierarchy. The hierarchical positions and social relationships influence the quality of life, for example, changing the reproductive and immune systems. This study characterizes the social hierarchy of the squirrel monkeys, Saimiri collinsi in captivity and examines the influence of intrinsic attributes in the hierarchy. Describes the intragroup associations networks and the relations between associations and the hierarchy and reproductive behavior. Furthermore, describes the care with offspring (parental and alloparental care) and addresses the association between mothers and allomothers in and out of care with offspring period. The results showed that dominance structure of S. collinsi is a partial hierarchy and that it is influenced by the age and body size. The association networks are formed based on sex classes and are not made for age, age-classes, or rank. The associations appear to be related to female power resistance to males sex advances. Moreover, allomothers included females with and without offspring and the association between mothers and allomothers was no different inside and outside of care with infants period.
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