Unfair Trade: Monkeys demand equitable exchanges

For the first time, researchers say, they have shown that a species other than Homo sapiens has a sense of fairness.

Female brown capuchin monkeys tend to turn uncooperative, and sometimes even throw things, if they see a neighbor receiving a lovely grape in exchange for the same token that gets them only a cucumber, according to Sarah Brosnan of Yerkes National Primate Research Center in Atlanta.