The Crow and the Pitcher

A Crow, half-dead with thirst, came upon a Pitcher with a little water in it. But the Pitcher was tall and the water was at the bottom, far beyond the reach of the Crow's beak. He tried to push the Pitcher over, but it was too heavy.

Then an idea came to him. He took a pebble from the ground and dropped it into the Pitcher. Then another, and another. Slowly, one pebble at a time, the water rose higher and higher. At last the water reached the brim, and the Crow drank to his heart's content. Necessity is the mother of invention.