Imagine swimming in the ocean and suddenly spotting a creature larger than any shark, faster than any human can sprint, and more vicious than any predator alive today. Meet the Mosasaurus, a marine ...

Dr. Scott explains all about the prehistoric marine species Mosasaurus. Dr. Scott explains all about the prehistoric marine species Mosasaurus. Dinosaur Train is available to stream on pbs.org and the ...

An enormous sea snake from Norse legend that was fathered by the trickster god Loki and grew big enough to circle the globe is now the namesake for a different type of “monster” — a newly discovered ...