Artwork of allosaurus and stegosaurus
This illustration shows what was probably a common scene during the late Jurassic Period, 150 million years ago - an allosaurus, the apex predator of the time, sizing up a stegosaurus. These animals coexisted in the same part of North America so it is likely that they had a predator-prey relationship., Photo by MARK GARLICK/SCIENCE PHOTO LIBRARY
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