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Title
As Chimpanzees Grow, So Does Yawn Contagion.
Abstract
The article reports on 2013 research finding that chimpanzee yawning grows more contagious as the animals grow older. It is said that the chimpanzees yawned in imitation of human yawning, possibly as a result of an increase an empathy as they age. Chimpanzees used in the study included orphans, infants, and juveniles.