Bearded Capuchin Monkeys (2 of 2) (IMAGE) PLOS Caption A bearded capuchin monkey cracks open a stably-placed palm nut with a stone for a hammer. Credit Barth Wright Usage Restrictions With credit to source License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.