Edwina, the Dinosaur Who Didn't Know She Was Extinct

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Edwina, the Dinosaur Who Didn't Know She Was Extinct is a children's picture book by Mo Willems. It was released in 2006 by Hyperion Books.
In the book, Edwina the dinosaur is well loved by the people of her town due to her acts of kindness. However, a boy named Reginald Von Hoobie-Doobie tries to convince everyone that dinosaurs are supposed to be extinct. Eventually, Edwina appeases him with a fresh batch of cookies.