Necessity is the mother of invention
On a hot summer day, a crow felt very thirsty. He was in search of water. He flew here and there but could find no water. He was much worried. At last, he reached a garden. He looked around and found a pitcher of water under a tree. He at once happed towards it. He peeped into the pitcher. There was a little water in it at its bottom. He tried to drink the water but was disappointed to find the water too low.
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He tried to break the pot with its beak but could not do so. He tried to go as deep into the pitcher as he could but its beak could no touch the level of the water. Then he tried to overturn the pitcher but it was too much for his strength. The crow was a clever and optimist. He began to think new devices. He saw a heap of pebbles nearby. He hit upon a plan.
He picked up a stone and dropped into the pitcher. He dropped some more stones one by one. The water rose a little. Then he dropped more stones till the water level rose so high he could drink it. Thus he quenched his thirst and flew away.