dinosaurs
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Ancient Tooth Reveals Attack Between Prehistoric Predators
About 210 million years ago, the supercontinent of Pangea was just starting to break up. At the time, dog-sized dinosaurs hid from the predators at the top of the food chain: reptiles called phytosaurs and rauisuchids. Now, with the discovery of an ancient tooth, scientists have found that these predators may have interacted with each other far more often than previously thought.
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