Photo: Duck-Billed Dinosaurs "Outgrew" Their Predators

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An artist's rendering shows the size differences between a duck-billed dinosaur (left) and a Tyrannosaurus rex at different ages.

The duck-billed dino grew three to five times faster than some of its more fearsome predators, giving it a size advantage that might have helped it to survive to adulthood, according to a paper published in August 2008.

Image courtesy Drew Lee/Ohio University

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