When monkeys in Thailand use stones as hammers and anvils to help them crack open nuts, they often accidentally create sharp flakes of rock that look like the stone cutting tools made by early humans.

Add Yahoo as a preferred source to see more of our stories on Google. An adult female chimpanzee cracks an oil palm nut with a stone hammer and anvil while her infant son looks at the camera. Video ...

Stephen has degrees in science (Physics major) and arts (English Literature and the History and Philosophy of Science), as well as a Graduate Diploma in Science Communication. Stephen has degrees in ...

Macaques use stones as hammers to smash open food items like shellfish and nuts. (Lydia V. Luncz) When monkeys in Thailand use stones as hammers and anvils to help them crack open nuts, they often ...