Millions of years ago, the megalodon shark was one of the scariest creatures to ever lurk in our seas. And even before that, the mosasaurs reigned supreme, terrorizing every ocean creature in sight.

Millions of years ago, the megalodon shark was one of the scariest creatures to ever lurk in our seas. And even before that, the mosasaurs reigned supreme, terrorizing every ocean creature in sight.

You wouldn’t want to swim in Late Cretaceous seas. If you’ve seen the first Jurassic World movie, you’ll recognize a mosasaur as the creature that leapt from the water to eat a great white shark. That ...