Simian Stone Age: Monkeys Used Rocks as Tools for Hundreds of Years

A group of wild capuchin monkeys in Brazil have used stones as tools to prepare their favorite meal of cashew nuts for more than 700 years, according to a new study. Archaeologists found evidence that capuchin monkeys in Brazil?s Serra da Capivara National Park have used stones to smash open the shells of cashew nuts and seeds for at least 100 monkey generations. The researchers observed young monkeys learning to use stones as tools from older monkeys at recognizable "cashew-processing sites," s