With very simple text, and much repetition, this is a book intended for very young students, celebrating the power of imagination.  It consists of an argument between a duck and a cat, as the cat tries to convince the duck to act like a duck, even though the duck keeps insisting he’s a cat.  The argument wraps up when duck decides to be a parrot, explaining that the day before he was a squirrel and last week he was a rooster, and tomorrow he intends to be a cow. The cat gives up.