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.