Knuffle Bunny: A Cautionary Tale is a children's picture book by Mo Willems. Released by Hyperion Books in 2004, an illustrated version of the book won the 2005 Caldecott Honor. The story also spawned an animated short, which won the Carnegie Medal for Excellence in Children's Video in 2007. In August 2007, the sequel, Knuffle Bunny Too: A Case of Mistaken Identity was published. The sequel follows the main character, Trixie, from the original Knuffle Bunny, three years later.