Greeting behaviour during party encounters in captive chimpanzees

Kyoko Okamoto*, Naoki Agetsuma, Shozo Kojima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Party encounter situations were experimentally produced in a group of captive chimpanzees (Pan troglodytes verus) at the Primate Research Institute of Kyoto University, Japan. During weekends all subjects (two adult males and five adult females) usually stayed together in the rooms (Baseline condition). Under experimental conditions, we shut passages between rooms to divide the subjects into two groups. We examined the effects of temporal separation of group members on affiliative interactions, aggressive interactions, and simple proximity. The frequency of affiliative interactions between male and female chimpanzees and between female chimpanzees increased when they encountered one another after separation, irrespective of male identity or housing history. Therefore we considered affiliative interactions between males and females during party encounters as being the response between separated individuals. The same tendency was not found in the frequency of affiliative interactions between females or between males. Unlike affiliative interactions, neither aggressive interactions nor simple proximity were influenced by separation.

Original languageEnglish
Pages (from-to)161-165
Number of pages5
Issue number2
Publication statusPublished - 2001 Jan 1
Externally publishedYes


  • Chimpanzee
  • Encounter
  • Experimental study
  • Greeting behaviour
  • Parties

ASJC Scopus subject areas

  • Animal Science and Zoology


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