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Male Yawning Is More Contagious than Female Yawning among Chimpanzees (Pan troglodytes)
- Jorg J. M. Massen,
- Dorith A. Vermunt,
- Elisabeth H. M. Sterck
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- Published: July 11, 2012
- https://doi.org/10.1371/journal.pone.0040697
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