Two chimps yawn after seeing video clips of chimps from their own social groups do it. Chimps also yawn just after watching familiar and unfamiliar humans doing it but they won't imitate baboons and unfamiliar chimps in the behavior. The animals' contagious yawning may be a sign of humanlike empathy. Read more at sciencenews.org.
Credit: M. Campbell and F. de Waal 2014/Yerkes National Primate Research Center/Emory Univ.
