Megalodons were massive predators that ruled the world's oceans. Hugo Saláis via Wikimedia Commons under CC BY 4.0 For nearly 20 million years, megalodons prowled the world’s oceans. The massive ...

Megalodon usually gets all the attention when it comes to sea monsters, but ancient oceans were full of predators just as strange and scary. Fossils tell us that long before modern sharks ruled the ...