The great apes, like humans, can recognize themselves in mirrors. They communicate by sound and gesture, form bands along what can only be called political lines, and sometimes engage in what is very clearly organized warfare. (Less frequently, too, they practice cannibalism.) In Chimpanzee Politics
Frans de Waal, a longtime student of simian behavior, analyzes the behavior of a captive tribe of chimpanzees, comparing its actions with those of ape societies in the wild. What he finds is often not pleasant: chimps seem capable of astonishing deviousness and savagery, which has obvious implications for the behavior their human cousins sometimes exhibit.
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An excellent book... Just as fresh and thought-provoking in 2008 as it was in 1983.