Scientists Unearthed a Trove of 700-Year-Old Stone Tools — Used by Monkeys

“What the study proves is that capuchins entered the stone age centuries ago and handed that knowledge down from generation to generation, rarely innovating in all that time. Their behavior follows that of West African chimps, which did the same with their technology, according to a groundbreaking 2007 study in the relatively new field of primate archaeology.”