Big Sharks Author:Tori Kosara Sharks have been around for more than 400 millions years - that means they were swimming through the oceans even before dinosaurs walked the earth! — Did you know: — The largest shark can be longer than a school bus? — Most sharks' skin feels like sandpaper? — A shark can have up to 4,000 teeth in its mouth at a time? — Dive into BIG SHARKS! to f... more »ind out all about the coolest fish on the planet.« less