Capuchin monkeys at Serra da Capivara National Park (SCNP) usually forage on the
ground for roots and fossorial arthropods, digging primarily with their hands but also using
stone tools to loosen the soil and aid the digging process. Here we describe the stone tools
used for digging by two groups of capuchins on SCNP. Both groups used tools while digging
three main food resources: Thiloa glaucocarpa tubers, Ocotea sp roots, and trapdoor
spiders. One explanation for the occurrence of tool use in primates is the “necessity …