Tool-making crows are the only animals known to make hooks out of plant material, which are 10 times faster at retrieving a snack than a simple twig, giving scientists a first glimpse of the "evolution of a new technology" in the animal kingdom, as reported in journal Nature Ecology and Evolution.

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Tool-making crows are the only animals known to make hooks out of plant material, which are 10 times faster at retrieving a snack than a simple twig, giving scientists a first glimpse of the "evolution of a new technology" in the animal kingdom, as reported in journal Nature Ecology and Evolution.