Two of the birds were successful on their first attempt to raise the height of the water to a level at which the worm floating on top could be reached whereas the other two birds needed a second try. Rooks belonging to the corvid (crow) family were used in the experiment. The clever birds were very adept and highly successful regardless of the starting level of the water and the number of the stones needed. In the first part of the study, researchers varied the height of water in the test tube so that the rooks used stones to raise the water level to reach a bug floating on top. The bug is the prize catch for the birds who know exactly how to use stones to increase water levels. It is about a thirsty crow using pebbles to raise the level of water in a pitcher to quench its thirst.īritish scientists have now demonstrated that rooks – a cousin of the crow – do exactly the same.įour rooks drop pebbles in a plastic test tube to increase the level of water on which a worm is floating. ![]() Aesop used the ‘crow and the pitcher’ story to explain that “necessity is the mother of invention”. ![]() But at least one such tale has now been found to be scientifically correct as well. It drank the water to its heart's content and flew away.Esop’s fables have ageless values to teach children about the basics of life. Gradually the water rose to the neck of the pitcher. It collected a few pebbles and put them into the pitcher one by one. There was water in it but the level was too low. It flew to the pitcher and peeped into it. ![]() After an hour of flying, it saw a pitcher near a house. A thirsty crow was flying about in search of water. He picked them up one by one and dropped them He then tried to overturn the pitcher but the could not. He tried to drink water but his efforts went in vain. Once upon a time, a crow was very thirsty.
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