Scientists find yawning contagious in chimpanzees as in humans

Scientists find yawning contagious in chimpanzees as in humans

TOKYO, Japan - A female chimpanzee named Ai, aged 27, watches video scenes of other chimps yawning (top photo), and then yawns herself (bottom photo). A research group led by Tetsuro Matsuzawa, a professor at the Primate Research Institute at Kyoto University, reported that chimpanzees watching video scenes of other chimps yawning yawned more often in response, showing that contagious behavior happens among primates other than humans. Photo was provided by Matsuzawa. (Kyodo)

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