Observes chimpanzees in the Ivory Coast's Tai National Park as they spend hours each day collecting, opening, and eating coule tree nuts. Examines the nut-cracking activities of chimpanzee groups, revealing the chimps' relationships, social life, and dominance. Contrasts the nut-cracking patterns of female and male chimpanzees, with emphasis on the caregiving habits of mother chimps and the evolution of nut-cracking ability in their young. Filmmakers: Christophe Boesch and Hedwige Boesch-Achermann.(Ref: Boesch, C., and Boesch-Achermann, H., "Dim forest, bright chimps," Natural History Magazine, September 1991.
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