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Why tool-wielding crows are left- or right-beaked


PhysOrg

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New Caledonian crows—well known for their impressive stick-wielding abilities—show preferences when it comes to holding their tools on the left or the right sides of their beaks, in much the same way that people are left- or right-handed. Now researchers reporting in the Cell Press journal Current Biology on December 4 suggest that those bill preferences allow each bird to keep the tip of its tool in view of the eye on the opposite side of its head. Crows aren't so much left- or right-beaked as they are left- or right-eyed.

 

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