A fey foray into existentialism from an emerging master of whimsy. Edwina is the nicest possible dinosaur, who bakes chocolate-chip cookies for everyone and helps little old ladies across the street. Everyone loves her except Reginald Von Hoobie-Doobie, the worst kind of know-it-all who takes it upon himself to convince Edwina that she is extinct and thereby to force her out of existence. When his campaign to persuade everyone else falls flat, it is left to the perpetually sweet Edwina to lend a sympathetic ear. How does she take the news of her impossible existence? She, like everyone but Reginald, just doesn’t care. A muted palette and two-dimensional backgrounds firmly situate Willems’s cartoons in an imaginary world of childhood, Edwina herself a masterful creation complete with hat, pearls and handbag, Reginald and the other humans Feiffer-esque in the expressiveness of their body language. Is this a sly jab in the ribs at another preternaturally kind T. rex? Who cares? The just-right resolution is a tribute to the child’s rock-solid faith in how the world should be, not how it really is. (Picture book. 4-7)