Have you ever wondered do animals have a sense of righteousness? Or are they simply unjust towards anyone they come across with?
Men by nature have a sense of righteousness. From an evolutionary point of view it could be concluded that it is a way of achieving personal gain.
But this benefit is important for human cooperation based on reciprocal altruism – helping those who help us.
But what about the animals?
Does the sense of fairness differentiates us from other animals, and whether there is such a feeling with them? Do animals really know when we are being unjust towards them?
By conducting an integrity test in animals, scientists discovered that we are not the only ones who have a sense of fairness.
After completing the test, an individual received a reward for completing the task, while the other received a consolation prize – which, in fact, this animal did not like.
The same test has been carried out in a family of crows. Ravens had to return a token to researchers which would then be rewarded.
The prizes consisted of slices of cucumber and grapes. Grapes for ravens are one of the favorite dishes, so an individual raven began protests, demanding the researcher grapes instead of cucumbers.
Except, when an individual has worked hard for his reward, and the other had his award given, the former individual ceased to participate.
Ravens are not unique. Injustice is recognized by other primates such as chimpanzees and macaque monkeys as well. And even some highly social mammals such as dogs and rats.