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

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

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

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 ...

A tooth recently found in the famous Hell Creek formation in Montana suggests otherwise. According to findings published on ...

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

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

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

Experts think the creatures adapted to river environments in the final million years before they became extinct.

Ancient Antarctic Sea Monster May Have Laid This Football-Size Egg. A 68 million-year-old egg the size of a football — the ...

Fossil egg found in Antarctica suggests marine reptiles laid eggs, challenging previous beliefs about ancient life.