aggression, (fighting within groups of the same community); outer-group aggression is grotesquely different.
             A chimpanzee community has a home range within which its members constantly roam. Usually the home range consists of roughly five to eight square miles. The adult male chimpanzees usually in groups of three, take turns patrolling the boundaries of their area keeping close together, silent and alert (Goodall, 1992:14). As they travel they pick up objects sniffing them as if they are trying to find clues to locate strangers. If a patrol meets up with a group from another community, both sides usually engage in threats, and then are likely to retreat back to their home ground (Holloway, 1974:261). But
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