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Crafty crows know what it takes to make a good tool


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Biologists have discovered how New Caledonian crows make one of their most sophisticated tool designs -- sticks with a neatly shaped hooked tip. New Caledonian crows are the only species besides humans known to manufacture hooked tools in the wild. The study reveals how crows manage to fashion particularly efficient tools, with well-defined 'deep' hooks.XIq_nUGQSQE

 

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