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

An artist's illustration shows Deinosuchus riograndensis swimming with an early alligator relative in the wetlands of the Western Interior Seaway in southwestern North America, during the Late ...

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

Prehistoric sea monster bigger than a killer whale may have terrorised rivers too - The mosasaur may have occupied a similar niche to modern-day saltwater crocodiles ...

(Gray News) – A university professor and his team discovered a 94-million-year old fossil in Utah that could help provide new evolutionary information for a creature that swam the oceans during the ...

Rare fossils uncovered in Colorado show an unexpected swamp-dwelling creature lived among the dinosaurs millions of years ago. A team of paleontologists uncovered the “new (or, more accurately, very ...