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Male Yawning Is More Contagious than Female Yawning among Chimpanzees (Pan troglodytes)

  • Jorg J. M. Massen ,

    jorgmassen@gmail.com

    Affiliations Department of Behavioural Biology, Utrecht University, Utrecht, The Netherlands, Department of Cognitive Biology, University of Vienna, Vienna, Austria

  • Dorith A. Vermunt,

    Affiliation Department of Behavioural Biology, Utrecht University, Utrecht, The Netherlands

  • Elisabeth H. M. Sterck

    Affiliations Department of Behavioural Biology, Utrecht University, Utrecht, The Netherlands, Ethology Research, Biomedical Primate Research Centre, Rijswijk, The Netherlands

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