The great white shark could have helped push the megalodon to extinction through a battle for food.
In the latest study, international researchers used zinc isotopes in the teeth of living and extinct sharks as a tool to understand the diet of long-dead animals.
This may have been a factor in the demise of the megalodon alongside climate change and other environmental pressures, the scientists said. The extinction has been studied from many different angles over the last decade, she said, with studies suggesting multiple factors. The megalodon was a megatooth shark, which roamed the oceans from about 22 million years ago until about three million years ago. Its name means "big tooth".
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