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Science and Space
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Allosaurus Artwork

Illustration: Allosaurus in a Jurassic landscape

An Allosaurus tramps through a Mesozoic-era forest in this artist's depiction. Allosaurus was the top predatory dinosaur of the late Jurassic period in North America. Not a particularly fast runner, it likely ambushed unsuspecting prey as it passed by.

Artwork by Chris Butler/Photo Researchers, Inc.