The example of 'grass in the ear' trend becoming popular among chimpanzees suggests that the primates often form new traditions by copying the habits of one of their group members, though these traditions are often seen only among one specific group. According to the researchers, a female chimp named Julie repeatedly put a stiff, strawlike blade of grass for no apparent reason in one or both of her ears and left it there even when she was grooming, playing or resting, ...
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