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Research Article

Chimpanzees Help Each Other upon Request

  • Shinya Yamamoto mail,

    yamamoto@darwin.c.u-tokyo.ac.jp

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

    X
  • Tatyana Humle,

    Affiliation: Wildlife Research Center, Kyoto University, Sakyo-ku, Kyoto, Japan

    X
  • Masayuki Tanaka

    Affiliation: Wildlife Research Center, Kyoto University, Sakyo-ku, Kyoto, Japan

    X
  • Published: October 14, 2009
  • DOI: 10.1371/journal.pone.0007416

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