Add Yahoo as a preferred source to see more of our stories on Google. An artist's illustration shows Deinosuchus riograndensis swimming with an early alligator relative in the wetlands of the Western ...

A 66-million-year-old tooth discovered in North Dakota, USA, suggests that some mosasaurs — extinct lizard-like reptiles that could grow up to 12 metres long — may have hunted in rivers as well as ...

This map shows the ancient western interior seaway that divided the "lost continent" of Laramidia from Appalachia, and distribution of dinosaurs found in the rich "dinosaur boneyard." Disclaimer: AAAS ...