The original link is here. It was an excellent TED speech by Joshua Klein. Well today I found another link on the subject. Interesting stuff (if you're a geek like me). In addition to the link, I've posted the video again off of TED.
http://www.telegraph.co.uk/earth/wildlife/5983953/Aesops-fable-is-true-shows-crow-study.html
"In a series of tests, the four rooks named Cook, Fry, Connelly and Monroe were offered a tempting treat - a juicy worm floating on the surface of water in a vertical tube.
To start with, the worm was out of reach. Videos of the experiments show the birds examining the tube from different angles, appearing to think the problem through.
Then the researchers provide a solution in the form of a handful of pebbles. The rooks can be seen picking up the stones and dropping them into the tube to raise the water level and bring the worm within reach.
Cook and Fry succeeded straight away, while Connelly and Monroe took two attempts.
The birds appeared to estimate how many pebbles were needed from the outset. Rather than try for the worm after each stone was dropped, they waited until the time seemed right.
They also selected larger stones over smaller ones, for greater effect.
In other experiments, the rooks quickly understood that sawdust cannot be displaced in the same way as water."
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