Kinship has been described as a major factor shaping primates’ social dynamics, with individuals biasing their affiliative interactions to their related counterparts. However, it has also been demonstrated that, under certain circumstances, social bonding can be established in the absence of kin. The fact that Colobus polykomos (western black-and-white colobus) and Procolobus badius temminckii (Temminck’s red c...