Human Morality and Sociality: Evolutionary and Comparative Perspectives by Henrik Høgh-Olesen

Author:Henrik Høgh-Olesen
Language: eng
Format: azw3
Publisher: Palgrave Macmillan
Published: 2009-12-09T05:00:00+00:00

Methods

We observed four neighboring chimpanzee communities in the Taï National Park, Côte d’Ivoire (for more details, see Boesch and Boesch-Achermann 2000; Boesch et al. in press). Observations started with the North Group in 1979, with habituation to human observers achieved by 1982 (see Figure 6.1 for the demographic data of the four communities). The Middle Group was fully habituated in 1995 and was under daily observation until summer 2004. The Middle Group shares a territory limit in the north with the North Group and in the south with the South Group (see map in Herbinger et al. 2001). This South Group was fully habituated in 1993 and has since been under constant observation by field assistants and students (see Figure 6.1). Habituation of the East Group started in 2000 and, by February 2005, 11 adult males had been identified and at least 2 more males were suspected to be present; similarly, 12 females have been identified, but the total number of females is still unknown. (See Figure 6.1. Note that numbers for the East Group are provisional; community size was estimated by assuming that the age structure and sex ratio were the same as in the three other communities.) The intergroup interactions reported here come from 25, 12 and 9 years of observations on the North, South, and Middle Groups, respectively.

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