乌鸦使用工具，黑猩猩们展示出道德。
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.
在围场中，猩猩们有0.1%的时间显得富有攻击性。
Chimps spent about 0.1% of their time being aggressive when they were in the enclosures.
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