Why yawning is contagious in bonobos: As with humans, yawning Is more contagious when individuals are closely related

Being socially close to another bonobo is more likely to make bonobo apes yawn in response to the other's yawns, according to new research. The researchers found that yawning in bonobos is more contagious when individuals are strongly bonded to one another as kin or close friends.

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