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.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2009/08/rook-line-and-sinker/197760/
