While movie megalodon is heightened for entertainment, the real thing was still huge. Megalodon was a white or mackerel shark, related to today’s great white shark. Some believe the whale shark is ...

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 ...

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