In this study, we investigated the reciprocal exchanges of grooming, tolerance and reduced aggression in common marmosets ( Callithrix jacchus), a cooperatively breeding primate whose groups are typically characterized by uniformly high genetic relatedness and high interdependency between group members. Both partner control and partner choice processes played a role in the reciprocal exchanges of grooming. In contrast, we did not find any evidence of reciprocity between grooming and tolerance over a preferred food source or between grooming and reduced aggression. Thus, reciprocity seems to play a variable role in the exchange of cooperative behaviors in marmosets. Am. J. Primatol. 77:222-228, 2015. © 2014 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR]