Inequity aversion in animals is the willingness to sacrifice material pay-offs for the sake of greater equality, something humans tend to do from early age. It manifests itself through negative responses when rewards are not distributed equally between animals. In controlled experiments it has been observed, in varying degrees, in capuchin monkeys, chimpanzees, macaques, marmosets, dogs, wolves, rats, crows and ravens. No evidence of the effect was found in tests with orangutans, owl monkeys, squirrel monkeys, tamarins, kea, and cleaner fish. Due to inconclusive evidence it is assumed that some bonobos, baboons, gibbons, and gorillas may be inequity averse.Disadvantageous inequity aversion is most common, that is, the animal protests when it gets a lesser reward than another animal. But ad