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Primates

, Volume 20, Issue 2, pp 161–183 | Cite as

Grouping of the pygmy chimpanzees

  • Suehisa Kuroda
Article

Abstract

The group formation inPan paniscus is flexible as inP. troglodytes. A group consisted of 16.9 chimps on the average, and a large groups of more than 30 chimps were often observed. The most frequent groups are of the mixed group type, which occupied 80% of the observed cases. The group size varies in accordance with the seasonal changes of the abundance and distribution of food resources, but in general it is larger than that ofP. troglodytes. The socionomic sex ratio does not seem to be highly correlated with the group size, and was around 76 on the average. And neither the proportion of females with infants in a group nor that of estrous females seems to be correlated with the group size. Therefore, the group composition appears to be rather uniform. This uniformity may be attributable toP. paniscus's concentrative nature and high male/female affinity. In comparison with the other African anthropoid apes,P. paniscus shows less sexual differentiation in its social structure.

Keywords

Social Structure Group Size Seasonal Change Food Resource Group Formation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Japan Monkey Centre 1979

Authors and Affiliations

  • Suehisa Kuroda
    • 1
  1. 1.Laboratory of Physical Anthropology, Faculty of ScienceKyoto UniversityKyotoJapan

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