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

New Caledonian crows 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 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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