Sex Differences in Object Manipulation in Wild Immature Chimpanzees (Pan troglodytes schweinfurthii) and Bonobos (Pan paniscus): Preparation for Tool Use?

• Kathelijne Koops ,

  * E-mail: kathelijne.koops@uzh.ch

  Affiliations Anthropological Institute and Museum, University of Zurich, Zürich, Switzerland, Department of Archaeology and Anthropology, Division of Biological Anthropology, University of Cambridge, Cambridge, United Kingdom

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• Takeshi Furuichi,

  Affiliation Primate Research Institute, Kyoto University, Aichi, Inuyama, Japan

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• Chie Hashimoto,

  Affiliation Primate Research Institute, Kyoto University, Aichi, Inuyama, Japan

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• Carel P. van Schaik

  Affiliation Anthropological Institute and Museum, University of Zurich, Zürich, Switzerland

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