Learned Aggression

“A surprising natural experiment, reported in Public Library of Science Biology, an online journal, suggests that the level of violence in baboon society is culturally determined. Cultural transmission of behaviour has been seen in many animals besides humans. But until now, it has concerned what foodstuffs are good to eat, how to make and use tools, and how to communicate (many bird songs, for example, have learned regional dialects). Cultural transmission of, for want of a better word, manners, has never before been observed outside Homo sapiens.”