Photo: Shark Ate Amphibian Ate Fish: First "Food-Chain Fossil"

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About 290 million years ago, a prehistoric shark ate an amphibian, which in turn ate a frog—and all three were preserved in one of the first food-chain fossils ever discovered.

The researchers are puzzled as to why modern-day sharks do not live in fresh water or eat amphibians like their ancient counterparts.

Images courtesy Berlin Museum of Natural History

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