We examined the production of stone tools by capuchins (Cebus apella).
Eleven subjects used five reduction techniques to produce 346 stone t
ools (48 cores and 298 flakes). They produced a sharp edge on 83% of t
he cores and largest flakes. Three monkeys later used a sample of thes
e objects as cutting tools. These results demonstrate that monkeys pro
duce lithic tools analogous to those produced by Oldowan hominids.