Doctor Dolittle's Circus is in a bad way and so the Doctor searches for a special new animal to add to the Circus' attractions. His discovery of Pippinella, a canary with the most beautiful voice he's ever heard, seems to solve the problems at first. But Dab-Dab the duck is still unhappy, and longs to return to her home in Puddleby-on-the-Marsh . .