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Shark Ate Amphibian Ate Fish: First "Food-Chain Fossil"
About 290 million years ago, Earth's lakes were a shark-eat-amphibian-eat-fish world, new fossil evidence reveals. A new fossil discovery looks like a set of Russian dolls: It's the preserved remains of a fish, which was eaten by an amphibian, which was then eaten by a shark. The fossil provides the first ever snapshot of an ancient, three-level, vertebrate food chain. An animal's last meal is very rarely preserved, because corrosive acids quickly erupt from the decaying stomach, dissolving any food remnants before fossilization can take place. But in this case, "the shark didn't just die and sink down and decompose," said Jürgen Kriwet, a paleontologist from Berlin's Museum of Natural History and co-author of a new study on the find.
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