There are a lot of people who are scared of sharks, but if we traveled back 1.5 million years, we'd find a monster that would terrify the biggest, baddest of sharks -the megalodon. And believe it or not, the megalodon is only ranked ten on TopTenz's list of teffifying prehistoric sea monsters.
So what's scarier than a megalodon? How about a dunkleosteus -a 30 foot long beast with a bite force of 8,000 pounds per square inch, which leaves it tied to with the T Rex and crocodiles for strongest bit force in history. Even scarier, the creature could open its mouth so quickly that it would vacuum food into its mouth -including prey as large as a human.
Check out the full list of horrific beasts at TopTenz.