Paleobiologist Kenshu Shimada (DePaul University, Chicago) holds a tooth of an extinct shark Otodus megalodon, or the so-called “Meg” or megatooth shark. (DePaul University/Jeff Carrion) (IMAGE)

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Paleobiologist Kenshu Shimada (DePaul University, Chicago) holds a tooth of an extinct shark Otodus megalodon, or the so-called “Meg” or megatooth shark. (DePaul University/Jeff Carrion)

Caption

Paleobiologist Kenshu Shimada (DePaul University, Chicago) holds a tooth of an extinct shark Otodus megalodon, or the so-called “Meg” or megatooth shark. (DePaul University/Jeff Carrion)

Credit

DePaul University/Jeff Carrion

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