A capuchin using a stone to break open its next meal. (Credit: Lisa Crawford/Shutterstock)

Among the rocky monoliths of Brazil’s Serra da Capivara National Park, wild monkeys crack cashews and seeds with an array of stone tools. Now, caches of ancient monkey tools reveal the primates started the culinary tradition 3,000 years ago.

This archaeological record also shows they adapted their food processing tactics over time. It’s the first time tool use stretching back thousands of years and