Chimpanzees can be vengeful, aggressively punishing a wrongdoer, but new research shows that they will not hurt another chimp just because they can.

• 黑猩猩会报复并严厉地处罚一个做坏事的同伴，但最近的研究表明，它们不会无故地伤害另一只黑猩猩，尽管它们可以这样做。