Unfair Trade: Monkeys demand equitable exchanges

By Susan Milius, 15:49 PM April 15, 2008

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. The clearest protests come from monkeys that see a neighbor getting that grape for free, she and...

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