> concepts like "fairness" or "caring" simply doesn't exist outside of human brains. We can test for a sense of fairness in animals. One test is the "inequity

> concepts like "fairness" or "caring" simply doesn't exist outside of human brains. We can test for a sense of fairness in animals. One test is the "inequity aversion task". Non-humans showing a sense of fairness on this test include dogs [1] and nonhuman primates, ravens and crows [2]. [1] https://www.cell.com/current-biology/fulltext/S0960-9822(17)30627-9 https://www.cell.com/current-biology/fulltext/S0960-9822(17)... [2] http://theconversation.com/animals-know-when-they-are-being-treated-unfairly-and-they-dont-like-it-73152 http://theconversation.com/animals-know-when-they-are-being-...