In an air race, the snail was far ahead, leaving all the opponents behind: dragonflies, bees, butterflies … and won the championship trophy.
From then on, the snail gloated. It carries the trophy on its back all day, for fear that others will not know that it is a flying champion. Snails sleep on trophies at night for fear of being stolen by others. However, this trophy is so big and heavy that the snail can't fly with it on his back.
Over time, the snail and the trophy stuck together and a pair of wings degenerated. The heavy trophy turned into a hard shell, and the snail barely poked its head out of the hard shell and crawled slowly on the ground.
Theme: Modesty makes people progress, while pride makes people lag behind. Being complacent in front of honor will hinder your progress.