Capuchin monkeys refuse to exchange pebbles for a slice of cucumber after seeing another monkey receive a more highly valued grape for its pebble (Brosnan & De Waal,2003).This suggests that nonhuman primates have a ____.

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The fact that the capuchin monkeys refuse to exchange pebbles for a slice of cucumber after seeing another monkey receive a more highly valued grape for its pebble suggests that they have a sense of fair play. They appear to understand the concept of unequal rewards and are not willing to accept an unfair exchange.

Capuchin Monkeys Refuse to Exchange Pebbles for a Slice of Cucumber