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

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

Mosasaurs were enormous reptiles best known for ruling ancient oceans more than 66 million years ago, but new evidence suggests some also lived in rivers. Scientists reached this conclusion after ...

Until now, these terrifying giant aquatic reptiles with a bulky skull and powerful jaws were thought to be sea-dwelling ...

Mosasaurs were some of the most fearsome apex predators to ever stalk the Cretaceous era’s oceans. And according to Mississippi Department of Environmental Quality (MDEQ) geologist James Starnes, a ...

Geologists working in Mississippi recently stumbled upon an incredible find: the fossil of an ancient marine apex predator. They uncovered a piece of vertebra they said likely belonged to a mosasaur, ...

This video explores how Mosasaurus evolved into a marine predator so dominant that it effectively “broke the game” of ...

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

A surprising fossil find shows that some mosasaurs lived in ancient rivers as oceans changed near the end of the Cretaceous.

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

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 ...