The Ant and the Dove
One day, an Ant went to the river to drink some water, but unfortunately he fell into the water and was just about to lose his life. That moment, a Dove saw him and, eager to save his life, threw a bough on the water, so that the Ant should climb on it. Soon, the Ant was out of any danger. He was very grateful to the Dove for saving his life, so, one day, when the Dove was in danger, too, because a hunter intended to shot at her, the Ant stung him in the foot. The hunter dropped his gun because of the pain, and the Dove flew away in a moment.
One good deed is rewarded with another good deed.