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 fascicularis), researchers have now confirmed an alternative explanatory approach. A combination of social disappointment with the human experimenter and some degree of food competition best explains their behavior in an ‘inequity aversion’ experiment.
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Source: ScienceDaily