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Article Source: Male Yawning Is More Contagious than Female Yawning among Chimpanzees (Pan troglodytes)
Massen JJM, Vermunt DA, Sterck EHM (2012) Male Yawning Is More Contagious than Female Yawning among Chimpanzees (Pan troglodytes). PLOS ONE 7(7): e40697. https://doi.org/10.1371/journal.pone.0040697

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