Humans aren’t the only ones who hate a bum deal, it turns out. In a recent study, brown capuchin monkeys trained to exchange a granite token for a cucumber treat often refused the swap if they saw ...

In a TED talk, primatologist Franz de Waal jokes that a philosopher wrote to him that it isn’t possible for monkeys to have a sense of fairness since fairness wasn’t invented until the French ...

A sense of fairness has long been considered purely human -- but animals also react with frustration when they are treated unequally by a person. In a study with long-tailed macaques (Macaca ...

It’s a question that has puzzled thinkers for centuries: Are we humans alone in our pursuit of fairness and the frustration we feel when others get what we want? In recent years, evolutionary ...