Rook, Line And Sinker

One of Aesop's fables just became reality:

Scientists have found that rooks – a member of the crow family – were able to figure out how to raise the water level in a laboratory container by dropping stones inside to retrieve a tasty worm floating on the surface [...] just like the mythical crow in the fable, which illustrates the virtue of ingenuity and how necessity is the mother of invention.