The social group of wild chimpanzees in the Mahali Mountains

  title={The social group of wild chimpanzees in the Mahali Mountains},
  author={Toshisada Nishida},
  • T. Nishida
  • Published 1 September 1968
  • Psychology
  • Primates
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. One of these groups was provisionized, that is, customarily fed sugar cane and bananas. The characteristics of the social group of wild chimpanzees are clarified by long-term observation of the baited population. The chimpanzees live in a clear-cut social unit which consists of adult males, adult females, and immature animals. The… 

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Demographic study of a large-sized unit-group of chimpanzees in the mahale mountains, Tanzania: A preliminary report

Long-term demographic observations on a large-sized unit-group of chimpanzees in the Mahale Mountains, Tanzania, reveal that the mortality rate of the male infants within 1 year almost doubled that of female infant, suggesting that the longevity of wild chimpanzees might be greater than estimated so far.

Group extinction and female transfer in wild chimpanzees in the Mahale National Park, Tanzania.

and Summary A unit-group (K-group) of chimpanzees has shown a drastic demographic change in the course of 17 years (1966–1983) of field study. K-group had 6 adult males in 1966. Initially, the

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It can be said that in chimpanzees, even females identify themselves with a particular unit-group, and that a chimpanzee unit- group should be regarded as a bisexual unit.

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Over the 16 years of the study, the Mimikire group of chimpanzees in the Mahale Mountains National Park, Tanzania found that the M group reduced their use of the northern part of their range and increased their frequency of visits to the eastern mountainous side of their home range.



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An ecological study of chimpanzees in a savanna woodland

From May, 1964, to September, 1965, the author made ecological and sociological studies of wild chimpanzees (Pan troglodytes) in Western Tanzania, East Africa, and found that the continuity of the group of chimpanzees is not stable but temporary, as has been reported by Goodall, etc.

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The ecological study of the wild life of chimpanzees living in dry open forest country is expected to throw some light on the ecology of Early Man, when Hominidae evolved from its anthropoid ancesters.

Chimpanzees in the wild.

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