Top 10 Terrifying Prehistoric Sea Monsters

The modern ocean is a scary place, filled with barracuda, sharks, super-squids, and possibly Cthulhu. However, no matter what we find in the depths these days, none of them seem to come close to the giant terrors that roamed the seas in Earth's past; giant sea-lizards, monster sharks and even "hypercarnivorous" whales. For most of these things, humans would barely qualify as a snack.

Here are 10 of the scariest monsters to ever call the ocean home in prehistory.


10. Megalodon

Megalodon is probably the best-known creature in the list; it's hard to keep the idea of a shark the size of a school bus out of pop culture. Plus, science-minded entertainment sources like the Discovery Channel love creatures that could pass for a movie monster. Despite the popular idea that Megalodon coexisted with dinosaurs, they lived from 25 to 1.5 million years ago, meaning that at best they missed the last dinosaur by 40 million years. On the other hand, this meant they might have still been around for the first humans. Eek.

Megalodons swam the warm oceans that were around until the last ice age in the early Pleistocene, which may have robbed them of their breeding grounds and food. Sometimes, it seems nature has our back.

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