Critically endangered golden-bellied capuchins (Sapajus xanthosternos) are more widespread than researchers previously thought, and stone tools might be the secret to their success. Although ...

Stone fragments produced by macaques in Thailand have been found to bear similarities to early human ancestor tools unearthed in some of the earliest archaeological sites in East Africa, a new study ...

A capuchin monkey in Costa Rica. Scientists studying the stone-smashing habits of bearded capuchin monkeys in Brazil have found that the primates inadvertently produce stone flakes that look very ...