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Example of contagious yawning in wolves.
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posted on 2014-08-27, 02:45 authored by Teresa Romero, Marie Ito, Atsuko Saito, Toshikazu Hasegawa(a) An individual (on the right) yawned during a resting period. (b) Few seconds later, the subject (on the left) yawned contagiously. Photograph by Teresa Romero.
