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Techno Crow: Do birds build up better tool designs?

New Caledonian crows don't have cell phones, yet, but researchers propose that these birds may ratchet up the sophistication of the tools they do have and pass along the better designs.

AVIAN UTENSILS. This New Caledonian stamp honors a crow species that nips twigs and leaves to make tools (at right) for working food out of crevices.</p><p>

AVIAN UTENSILS. This New Caledonian stamp honors a crow species that nips twigs and leaves to make tools (at right) for working food out of crevices.


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