Archaeological evidence indicates that chimpanzee nut-cracking traditions have persisted for more than 4,300 years.
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- https://www.mpg.de/550270/pressRelease20070207 (mpg.de)
- https://www.scientificamerican.com/article/chimpanzee-nut-bashing-technology-thousands-years-old/ (scientificamerican.com)
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