Английская Википедия:Grass-in-ear behavior

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Young monkey looking at a piece of grass

The grass-in-ear behavior, object-in-ear behavior[1] or grass-in-the-ear technique[2] is a fashion statement-like behavior that some chimpanzees do. The unusual behavior has been named by scientists, and it appears to be one of the first times that chimpanzees have created a tradition that has no discernible purpose.[3]

History

It was first documented in 2010 in the Zambian Chimfunshi Wildlife Orphanage sanctuary's grassy territory when a chimpanzee named Julie stuck a piece of grass into her ear, and left it there.[4][5] But after Julie did it, other chimpanzees in her group began to follow suit, beginning with her son[6].[7] The behavior continued to spread even after Julie died, which shows that the behaviour was established as a form of Social learning in animals, an important component of Animal culture.

References

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