But in the baboon study, the culture being conveyed is less a specific behavior or skill than a global code of conduct. ''You can more accurately describe it as the social ethos of group,'' said Dr. Andrew Whiten, a professor of evolutionary and developmental psychology at the University of St. Andrews in Scotland who has studied chimpanzee culture. ''It's an attitude that's being transmitted.''

The report also offers real-world proof of a principle first demonstrated in captive populations of monkeys: that with the right upbringing, diplomacy is infectious. Dr. Frans B. M. de Waal, the director of the Living Links Center at the Yerkes National Primate Research Center of Emory University in Atlanta, has shown that if the normally pugilistic rhesus monkeys are reared with the more conciliatory stumptailed monkeys, the rhesus monkeys learn the value of tolerance, peacemaking and mutual hip-hugging.

Dr. de Waal, who wrote an essay to accompany the new baboon study, said in a telephone interview, ''The good news for humans is that it looks like peaceful conditions, once established, can be maintained,'' he said.

''And if baboons can do it,'' he said, ''why not us? The bad news is that you might have to first knock out all the most aggressive males to get there.''

Jerkiness or worse certainly seems to be a job description for ordinary male baboons. The average young male, after wheedling his way into a new troop at around age 7, spends his prime years seeking to fang his way up the hierarchy; and once he's gained some status, he devotes many a leisure hour to whimsical displays of power at scant personal cost. He harasses and attacks females, which weigh half his hundred pounds and lack his thumb-thick canines, or he terrorizes the low-ranking males he knows cannot retaliate.

Dr. Barbara Smuts, a primatologist at the University of Michigan who wrote the 1985 book ''Sex and Friendship in Baboons,'' said that the females in the troop she studied received a serious bite from a male annually, maybe losing a strip of flesh or part of an ear in the process. As they age and lose their strength, however, males may calm down and adopt a new approach to group living, affiliating with females so devotedly that they keep their reproductive opportunities going even as their ranking in the male hierarchy plunges.

For their part, female baboons, which live up to 25 years -- compared with the male's 18 -- inherit their rank in the gynocracy from their mothers and so spend less time fighting for dominance. They do, however, readily battle females from outside the fold, for they, not the males, are the keepers of turf and dynasty.