![]() The share of each isotope in tooth enamel can offer clues about where an animal fell within a food web. To figure out if the two sharks dined on similar food, the researchers looked at the zinc in their teeth. That’s about when great white sharks ( Carcharodon carcharias) emerged. Or it may have vanished as early as 3.5 million years ago. The species may have died out about 2.6 million years ago. When - and why - it went extinct hasn’t been clear. This giant began menacing the oceans around 23 million years ago. Some grew at least 14 meters (46 feet) long. ![]() Megalodon ( Otodus megalodon) was one of the largest carnivores to ever live. He’s a geoscientist at the Max Planck Institute for Evolutionary Anthropology. Researchers shared their findings May 31 in Nature Communications. That competition, it now appears, may have helped push megalodons toward extinction. New analyses of shark teeth hint that these two marine monsters hunted the same prey. For millions of years, giant sharks called megalodons were the ocean’s top predators.
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