Some 66 million years ago, a city bus-sized terrifying predator prowled a prehistoric river in what is now North Dakota. This finding is based on the analysis of a single mosasaur tooth conducted by ...

Mosasaurs were the apex predators of the oceans during the reign of the dinosaurs, but new research reveals dinosaurs weren't safe from them in rivers either. Researchers from Sweden, the US, and the ...

At the end of the Cretaceous Period, a type of giant reptile called mosasaurs occupied and dominated oceanic food webs. Mosasaurs had long bodies and were related to both snakes and monitor lizards.

The remnants of a mosasaur show a sea predator that was ill equipped for slashing bites, and likely preferred to swallow its prey whole. Reading time 2 minutes Whoever said everything is bigger in ...

A giant ocean predator that terrorised the seas during the time of the dinosaurs may have also hunted in rivers, a tooth fossil discovered in North Dakota suggests. The extinct lizard-like reptile ...