Social tolerance lies at the basis of many individual and social behaviours that bear substantial weight for survival and reproductive success, and can be seen as one way of coping with conflicts of interest that arise when animals live together in social groups (De Waal, 2010). Defined as "the propensity to be in proximity to conspecifics around valuable resources with little or no aggression" (Cronin & Sánchez, 2012), social tolerance facilitates amongst others information transmission (van Schaik et al., 2003), cooperative engagement Hare et al., 2007;Melis et al., 2006) and reciprocal resource exchange (Cronin et al., 2010). Tolerating conspecifics could therefore be seen as a mechanism by which group members can adaptively overcome the competitive inter-individual forces