Fifteen million years ago, now-extinct species of dolphins, whales and large sea cows roamed the world’s oceans, topping the underwater food chain. Yet back then, any one of these creatures could ...

Fifty years after Jaws hit theaters, and there’s still a lot we don’t know about sharks, which lends to their reputation as mysterious predators. There’s even more we don’t know about ancient sharks, ...

Megalodon is an extinct species of shark that lived from around 23 million to around 3.6 million years ago, during which time it occupied a prime position at the top of the food web, before being ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Paleobiologist Dr ...