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Crows 'Hooked' on Fast Food

Some New Caledonian crows craft hooked tools out of branched twigs, and Scottish biologists have discovered why - the birds can extract food from cracks and crevises several times faster than by using straight twigs. "It is a painstaking sequence of behaviors,” explains Professor James St. Clair, from the University of St. Andrews, the lead author of the new study in the current issue of Nature Ecology & Evolution.  “Crows seek out particular plant species, harvest a forked...

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