Once upon a time there were four friends: Ant, Little Chicken, Little Mouse and Little Worm. They went for a walk and on the shore of the pond met a Frog who called them into the water - to swim. Friends did not know how to swim and the Frog began to laugh at them: "Well, where are you fit? You are cowards." Friends decided to sail and together they built a boat from a piece of bark, twig, and a large sheet instead of a sail. Friends floated merrily on a ship, but suddenly a cloud covered the sun, the wind increased and began a thunderstorm.