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Chimps: 2 Raisins Are Better Than None

Caption: Frodo may not have sensitivity to fairness, but he knows what is good for him. Here he appears to be waiting for food to be thrown to him by staff at the Wolfgang Köhler Primate Research Centre. This image relates to an article that appeared in the Oct. 5, 2007, issue of the journal Science, published by AAAS. The study, by Dr. Keith Jensen and colleagues at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, was titled "Chimpanzees Are Rational Maximizers in an Ultimatum Game."

Credit: Image courtesy of The Max Planck Society

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