There's an interesting article in the New York Times on warfare among chimpanzees. One problem, though, is that they attempt to explain the level of coordination necessary in warfare with group selection. This, of course, will not do. I'm under-read in evolutionary biology, but it seems like kin selection accounts for this phenomenon just fine. You are more likely to be related to members of your group than an opposing group, so taking territory from a rival group doesn't just increase your fitness directly, but indirectly through your shared genes among group members.
What do you think, LessWrong?
edit: Some commentary on the article.
they attempt to explain the level of coordination necessary in warfare with group selection. This, of course, will not do.
Group selection has been vilified; but irrationally so. Group selection has been observed many times in human groups, so dismissing it is silly.
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