Prehistoric sea monster bigger than a killer whale may have terrorised rivers too - The mosasaur may have occupied a similar ...

A giant marine predator, once believed to roam only the seas, may have also inhabited ancient rivers 66 million years ago.

Mosasaurs, giant marine reptiles that existed more than 66 million years ago, lived not only in the sea but also in rivers.

A giant ocean predator that terrorised the seas during the time of the dinosaurs may have also hunted in rivers, a tooth ...

A 66-million-year-old tooth discovered in North Dakota, USA, suggests that some mosasaurs — extinct lizard-like reptiles that could grow up to 12 ...

Learn how chemical clues reveal a mosasaur was hunting in freshwater rivers as the Cretaceous seaway receded.

Over the summer, campers from the Montana Learning Center near Helena and the Carter County Museum partnered to excavate a mosasaur found in eastern Montana. According to Ryan Hannahoe, executive ...

Texas teen Walter Campbell wasn't sure what to make of pointy bits poking through Prairie dirt during a fossil hunt last month with his grandfather in southern Manitoba. But within moments it was ...

Jeffrey is a freelance features writer at Collider. He is an MPA-accredited entertainment journalist and a Tomatometer-approved critic based in the LA area. He graduated from the University of Texas ...