, Volume 24, Issue 4, pp 486–500 | Cite as

Comparison of the communicative vocalizations and behaviors of group ranging in eastern gorillas, chimpanzees and pygmy chimpanzees

  • Akio Mori


Field observations were carried out on chimpanzees, pygmy chimpanzees and eastern gorillas. Since the communicative behaviors which appear in group ranging are closely related to the grouping of the animals and to the social structure, the communicative behaviors of group ranging were compared in the above three species in order to elucidate the common and different characters of their three much diversified social structures. The following conclusions were drawn: (1) the common ancestor ofGorilla andPan had the territorial call “hoot” and behavior of display, and males were antagonistic between each other in the society; (2) the common ancestral species did not have any special long distance cohesive calling: the society was a small compact one, moving on the ground; and (3) the social structure of the pygmy chimpanzee is very different from the common ancestral social structure when compared with those of the gorilla and chimpanzee, in that the pygmy chimpanzee has lost the behaviors of strong antagonistic character between adult males.


Social Structure Adult Male Common Ancestor Field Observation Animal Ecology 
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Copyright information

© Japan Monkey Centre 1983

Authors and Affiliations

  • Akio Mori
    • 1
  1. 1.Primate Research InstituteKyoto UniversityInuyama, AichiJapan

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