Monkeys "Go on Strike" When They Sense Unfairness
In recent tests designed to assess monkeys’ sense of fairness, a group of brown capuchin monkeys “went on strike” and refused to perform routine tasks when they saw others receiving greater rewards for the same tasks.
同じことしているのに違うサルが多くの報酬をもらっているのを見ると、やるのを中止して攻撃的になるとか。
http://www.pnas.org/cgi/content/abstract/0707182104v1?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Brosnan%2C+Sarah&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT