New discoveries among Africa's chimpanzees.
DeVore (ed.) Holt, Rinehart & Winston, New York.
In: Primate Behavior: Field Studies of Monkeys and Apes, I. Chimpanzees in Kabogo Point Area, Tanganyika. Progress report of the survey of chimpanzees in their natural habitat, Kabogo Point Area, Tanganyika. Presented at the 4th East African Academy Symposium, Kampala, on September 21, 1966.Īzuma, S. Some aspects of blue monkey social organization. The member-exchange among unit-groups may sometimes occur, but the extent of openness or closedness of a unit-group has not been well elucidated.Īldrich-Blake, F. The home ranges of unit-groups overlap each other extensively, the overlapping areas being used flexibly by both unit-groups on the basis of dominance-subordination relationship. The inter-unit-group interaction is peaceful the subordinate unit-group avoids the dominant one. The random nature of the membership of subgroups is emphasized in this paper, although subgroups are usually composed by social bonds on the basis of similar age, sex, blood relationship, and/or sexual attraction. The centralization of a unitgroup is mainly sustained by the high sociability of adult males. The size of the subgroups of the baited population ranges from one to 28 head, the mean being 8.1 head. The unit-group generally splits up into temporary subgroups that repeat joining and parting.
The size of unit-groups ranges from 30 to 80 head. The permanency, stable membership, and integrative nature of the unit-group were confirmed during the course of this study. The chimpanzees live in a clear-cut social unit which consists of adult males, adult females, and immature animals. The characteristics of the social group of wild chimpanzees are clarified by long-term observation of the baited population. One of these groups was provisionized, that is, customarily fed sugar cane and bananas. There are more than six large groups of wild chimpanzees in the study area, which is in the north-eastern part of the Mahali Mountains of Western Tanzainia.
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