Inside the Minds of Animals - TIME

Inside the Minds of Animals - TIME: "a zoologist at the University of Cambridge — the aptly named Christopher Bird — found that the rook, a member of the crow family, could reason through how to drop stones into a pitcher partly filled with water in order to raise the level high enough to drink from it. What's more, the rooks selected the largest stones first, apparently realizing they would raise the level faster. Aesop wrote a tale about a bird that managed just such a task more than 2,500 years ago, but it took 21st century scientists to show that the feat is no fable."