‘Truly remarkable’ fossil is rare evidence of ancient shark-on-shark attacks

This illustration, depicting an active predatory encounter between two requiem sharks off what is now the coast of Maryland, shows one possible way the shark vertebra could have been bitten.  (Image credit: Original drawing by Tim Scheirer; Coloration added by Clarence Schumaker; CC BY 4.0)

During the age of megalodon, sharks hunted all kinds of creatures, including other sharks, according to a new study based on four rare fossils.

In four separate finds, researchers and amateur fossil hunters discovered the ancient vertebrae of now-extinct sharks; all four vertebrae are covered in shark bite marks, and two still have pointy shark teeth sticking out of them. These findings are extraordinary, as shark skeletons are made of cartilage, which doesn’t fossilize well, the researchers said. 

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