 He sings the Quaq Quao theme song and performs acrobatics in the water, generally having a good time before he meets the guest creature for the episode.The creature is usually another animal, although four of the creatures were a jack-in-the-box (The Bugbear - probably an Italian misunderstanding of what a bugbear is), a racecar, a cloud and a train.He quacks at the creature and behaves like a duck, and the creature makes sounds and behaves appropriately for its type.