Meet Tylosaurus Rex: The 43-Foot Sea Monster That Ruled Ancient Oceans

Scientists just discovered fossils of a MASSIVE sea creature called Tylosaurus rex that was longer than a school bus and hunted in oceans 80 million years ago! This giant marine reptile [a water-dwelling scaled animal] was one of the biggest and most fearsome predators ever to swim the seas. Imagine running into something that huge while taking a swim—yikes!