a crow is standing in a bucket of water

One hot day a crow was very thirsty. He searched for water everywhere, but there was water anywhere. All the lakes and ponds were dry. At last he saw a pot under a tree with very little water in it. He tried hard but could not reach the water as it was very low. He picked up pebbles one by one and dropped them into the pot. The level of water came up. The crow drained the water and flew away-feeling very happy.