Giant mosasaurs, once thought to be strictly ocean-dwelling predators, may have spent their final chapter prowling freshwater ...

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

At the end of the Cretaceous Period, a type of giant reptile called mosasaurs occupied and dominated oceanic food webs.

Mosasaurs are best known as fearsome marine reptiles that ruled the oceans at the end of the dinosaur era. But new research ...

Mosasaurs, giant marine reptiles that existed more than 66 million years ago, lived not only in the sea but also in rivers. This is shown by new research based on analyses of a mosasaur tooth found in ...

A giant bone from North America's largest dinosaur was found in West Texas. Sul Ross State University geology students uncovered the fossil while on a research mission at Big Bend National Park in ...

Discover the extraordinary prehistoric giants – from mega-sloths to monster sharks – that once made today’s animals look ...

A fossil reveals the existence of Athenar bermani, a new sauropod that redefines the family tree of Utah's giants.

(CNN) — A massive, extinct reptile that once snacked on dinosaurs had a broad snout like an alligator’s, but it owed its success to a trait that modern alligators lack: tolerance for salt water.

Researchers have reclassified a long-misidentified fossil from New Mexico as Ahshiselsaurus wimani, a newly recognized giant duck-billed dinosaur that offers fresh insights into hadrosaur evolution ...

There might still be dinosaurs living on Earth today — if not for the giant asteroid. It’s a long-debated issue, but now researchers say the idea Dinosaurs were in decline before the Chicxulub ...