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One of Aesop's fables may have been based on fact, scientists report. In the tale, written more than 2,000 years ago, a crow uses stones to raise the water level in a pitcher so it can reach the liquid to quench its thirst.
Now a study published in Current Biology reveals that it is true. The birds were shown a clear tube containing a small amount of water. Floating upon it was an out-of-reach worm. And a pile of stones were positioned nearby. The rooks had to put multiple stones in the tube until the worm floats to the top
And the four birds did just that. Two, called Cook and Fry, raised the water-level enough to grab the floating feast the very first time that they were presented with the test, while Connelly and Monroe were successful on their second attempt. The birds were extremely accurate, using the exact number of stones needed to raise the worm to a height where they could reach it.