Offered without commentary is this link to a post on Psychology Today applying game theory to chimpanzees and mortgage bankers. The researchers used the classic Ultimatum Game, which gives the first of two players some sum of money to divide. If the second player accepts the terms, both players keep their money. If the second player declines (presumably because he thinks the split is inequitable), both players receive zero. The strictly rational game would dictate that the first player keep all but a penny and the second player accepts, because anything is better than nothing.
Which group is more rational? Which group is more fair? Place your bets, then check it out here.
UPDATE: Now with a link that actually works (I hope)! Sorry all, but thanks for the heads up.