一只秃鼻乌鸦，发出寂寞又焦虑不安的声音，从她头顶孤独地飞过。
Way above her a solitary rook cawed its way home - a lonely, troubled sound.
剑桥大学研究人员发现，秃鼻乌鸦能够使用和制工具，具有和猩猩一样的高智商。
Researchers at the University of Cambridge found that crows have the capacity to use and make tools thanks to a sophisticated intelligence that rivals that of chimpanzees.
伯德说，这些实验之所以有趣，因为野生环境下生活的秃鼻乌鸦食物来源丰富，不需要使用工具。
Byrd said that wild corvus frugileguses do not need to use tools because of their rich food resources, but these four domestic corvus frugileguses didn't get any relevant training before tests.
伯德说，这些实验之所以有趣，因为野生环境下生活的秃鼻乌鸦食物来源丰富，不需要使用工具。
Byrd said that wild corvus frugileguses do not need to use tools because of their rich food resources, but these four domestic corvus frugileguses didn't get any relevant training before tests.
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