Patrícia Izar

TL;DR: In this article, the authors found that tool use within these capuchin populations seems to be a behavioral tradition that is socially learned and is primarily associated with more terrestrial habits, however, differences in the diversity of "tool kits" between populations remain to be understood.

TL;DR: In this article, the authors conducted an exploratory investigation in an area where nut-cracking by wild capuchin monkeys is common knowledge among local residents and found physical evidence that monkeys cracked nuts on rock outcrops, boulders, and logs (collectively termed anvils).

TL;DR: It is demonstrated that capuchins, which last shared a common ancestor with humans 35 million years ago, faced with stones differing in functional features (friability and weight), choose, transport, and use the effective stone to crack nuts.

TL;DR: Findings are reported showing that the choice of observational targets is an active, non-random process, and that observers seem to have some understanding of the relative proficiency of their group mates, preferentially watching the more skilled nutcrackers, which enhances not only scrounging payoffs, but also social learning opportunities.