The researchers reported
that some relatives of crows called rooks in an experiment used the same stone-dropping strategy to get their hands at a worm lying inside a cylinder.
Christopher Bird, the leader of the research team, and his colleagues exposed the rook to a 6-inch plastic cylinder containing water with a worm on its surface.
The rook then used the stone-dropping strategy, slowly but surely getting closer to the prized worm.
Researchers also concluded that the Aesop fable's crow might have actually been a rook, saying that both kinds of birds were called crow during that time.