The remarkable tool making of crows offers scientists a chance to search in other species for the equivalent of human handedness, say New Zealand researchers.
New Caledonian crows make probes from tree leaves to poke at hard-to-reach prey, explains Gavin Hunt of the University of Auckland. After analyzing the leaves left over from the production of 3,700 crow tools, Hunt and his colleagues conclude that the birds prefer working on the left edge of a leaf instead of the right. The researchers report their finding in the Dec. 13 Nature.
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