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The Gruffalo is a British children's picture book by writer and playwright Julia Donaldson, illustrated by Axel Scheffler, that tells the story of a mouse, the protagonist of the book, taking a walk in the woods. The book has sold over 13 million copies, has won several prizes for children's literature, and has been developed into plays on both the West End and Broadway and even an Oscar nominated animated film.

The Gruffalo was initially published in 1999 in the United Kingdom by Macmillan Children's Books.