Popo the unique frog is busy pretending to be other animals while all his friends are practicing fly-catching. He tries to hang like a monkey, or fly like an eagle, only to fall to his failure. After his seemingly meaningless efforts, Popo is dragged off to fly-catching practice by his mother. Later, all his friends who have practiced fly-catching put their skills to the test, but fails. Then, Popo jumps like a tiger, hangs like a monkey, crawls like a snake, and takes off like an eagle to catch a fly successfully, just like he always practiced. This story conveys the traditional message of how failure is indeed the mother of success.