Bearded capuchin (Sapajus libidinosus) predation on a rock cavy (Kerodon rupestris) followed by prey sharing.

We describe predation on an adult rodent rock cavy and sharing of the carcass by a group of male bearded capuchins. Despite many studies, such an interaction has never been observed in bearded capuchins. Rock cavies are large rodents weighing around 25% of the weight of an adult male bearded capuchin. The capuchins chased, caught, and shared the adult rock cavy. We observed no strong evidence of communication or division of roles in the successful capture, suggesting that the social hunting episode was not necessarily coordinated or collaborative. Instead, the individuals apparently tried to achieve the same goal of capturing the prey simultaneously (i.e., individuals synchronously performed similar actions to achieve the task), with the strongest individual emerging victorious and tolerating prey sharing afterwards. Our observations add to the understanding of cooperative behaviours such as social hunting and food sharing in bearded capuchins.