"The Pigeon Needs a Bath!" is a children's picture book written and illustrated by Mo Willems. The story features Pigeon, a character who humorously insists that he does not need a bath, despite the obvious need for cleanliness. Throughout the book, Pigeon expresses his reluctance and offers various excuses to avoid taking a bath. The engaging illustrations and simple text make it easy for young readers to relate to Pigeon's antics, while also conveying the importance of personal hygiene in a fun and entertaining way.