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Journals and Conferences
It has been said that there is no stable and permanent social unit in a society of chimpanzees. From observations at Filabanga in Western Tanzania and some other observed cases, we concluded that a large-sized group consisting of 30–50 animals is a social unit common to chimpanzees, and pointed out that chimpanzees freely repeat grouping and dispersion… (More)
This paper reports how the wild Japanese monkeys at Mt. Takasaki-Yama (City of Oita, Kyusyu) adapted themselves, in terms of food habits, to the change of environments, which was caused by the contact with men. This report contains following problems; 1) acquisition of new food habits, namely one of acculturation problems, 2) the difference in the acquiring… (More)
A very isolated population ofColobus angolensis has been newly discovered in Tanzania. The monkey has white, long epaulettes and cheek hair, but no white pygal band. Its tail has somewhat of a brushy tip, and is grey in color. This may very well be a heretofore undescribed, and distinct subspecies.