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Researchers have observed wild-bearded capuchin monkeys in Brazil deliberately break stones, unintentionally creating flakes that share many of the characteristics of those produced by early Stone Age hominins.

'Monkeys make stone flakes too so humans are not unique after all' Erni

Image: Erni, 

In a paper, published in Nature, the research team says this finding is significant because archaeologists had always understood that the production of multiple stone flakes with characteristics such as conchoidal fractures and sharp cutting edges was a behaviour unique to hominins. The paper suggests that scholars may have to refine their criteria for identifying intentionally produced early stone flakes made by hominins, given capuchins have been observed unintentionally making similar tools. The difference is that the capuchins’ flakes are not intentional cutting tools, but seem to be the by-product of hammering  stones. The monkeys are seen licking them, so one possibility could be that they are extracting minerals or lichen from the stones.

Read more on the University website (opens new window)