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Research Article

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

  • Jorg J. M. Massen mail,

    jorgmassen@gmail.com

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

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  • Dorith A. Vermunt,

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

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  • 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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  • Published: July 11, 2012
  • DOI: 10.1371/journal.pone.0040697

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