Evidence of capuchin monkeys using tools 3000 years ago
(PHYSorg.com Archaeology & Fossils)

A team of researchers affiliated with several institutions in Brazil and the U.K., has found evidence of capuchin monkeys using stone tools as far back as 3,000 years ago. In their paper published in Nature Ecology and Evolution, the group describes the archaeological dig they carried out and the stone tool artifacts they found.