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 her Yerkes colleague Frans de Waal report in the Sept. 18 Nature.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.