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Why are chimps sticking grass in their ears?

A cool new trend is catching on, and it’s called the “grass-in-ear behavior,” The Dodo reports. Researchers studying a troop of chimpanzees noticed eight out of 12 of them putting a blade of grass in their ear and letting it dangle. To find out what was going on, they observed three more groups to see if the behavior was present; it wasn’t. The researchers, who describe their observations this month in Animal Cognition, suspect the “look” began with a chimp named Julie, and others within the gang soon copied her

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