Leviathan melvillei was one of the most terrifying marine predators to ever exist, dominating the oceans millions of years before humans appeared . This gigantic prehistoric sperm whale reached ...

Add Yahoo as a preferred source to see more of our stories on Google. Roaming the ancient seas eons ago, the megalodon shark eviscerated its prey with jaws that were 10 feet wide. Warpaintcobra/iStock ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. The extinct Megalodon, meaning "big tooth," was an apex ...