A team of researchers from Utrecht University, Durham University, and other institutions have observed something remarkable at a chimpanzee sanctuary in Zambia. Several chimpanzees from one particular group were seen dangling blades of grass from their ear holes or their behinds, for no apparent reason. The behavior was not seen in other chimpanzee groups at the same sanctuary, despite similar living conditions.



Summary

Researchers observed a peculiar behavior in one group of chimpanzees at a Zambian sanctuary: they were seen inserting blades of grass into their ears or behinds. This seemingly pointless “grass-dangling” behavior was unique to this specific group, despite other groups at the same sanctuary living in similar environments. The study highlights the potential for distinct, localized cultural traditions to develop within chimpanzee populations, even in controlled settings. The reason for this unique behavior remains unknown.

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