乌鸦使用工具，黑猩猩们展示出道德。
雄猩猩们一次次重击受害者，留下它们重伤而终。
The male chimps pounded and pounded their victims and left them to die of awful injuries.
不过它们也显示出了和黑猩猩们诸多不同的行为改变。
But they also showed numerous changes of behaviour that were different from those seen in chimpanzees.
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