The mighty megalodon is the most famous prehistoric shark, a huge predator that roamed the oceans from 23 to 2.6 million ...

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In order to tackle prey as large as whales, megalodon had to be able to open its mouth wide. It’s estimated that its jaw would span 2.7 by 3.4 metres wide. That’s easily big enough to swallow two ...

Megalodon may be the most well-known prehistoric ... Weirdest of all was probably Helicoprion (bottom), which had a lower jaw shaped like a buzz saw and no teeth at all in its upper jaw.

In order to tackle prey as large as whales, megalodon had to be able to open its mouth wide. It’s estimated that its jaw would span 2.7 by 3.4 metres wide. That’s easily big enough to swallow two ...

Roaming the ancient seas eons ago, the megalodon shark eviscerated its prey with jaws that were 10 feet wide. Warpaintcobra/iStock via Getty Images Plus ...