The Cretaceous period was basically the Earth’s goth phase, when all it cared about was finding something evil and monstrous enough to freak out its conservative parents. And it finally found that in the Hainosaurus and Tylosaurus, two types of prehistoric sea lizard that mama sharks used to scare their little shark babies into finishing their mackerel. Oh, and hey: You don’t need to imagine what those freaky shark nightmares looked like; National Geographic has done that for you.
But don’t worry; it’s not what it looks like. Tylosaurus didn’t really use that row of vicious teeth, nor even the two additional rows behind it. They were just there to make sure anything it swallowed whole didn’t wriggle free.
Oh, right: They swallowed sharks whole.