Life looked different after an asteroid crashed into the planet around 66 million years ago. The dinosaurs died out, the arboreal mammals declined, and the terrestrial mammals thrived. The traditional ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. NEW YORK (AP) — An unusual find in China ...

A microbiologist named João Pedro de Magalhães has proposed the idea that the reign of dinosaurs forced mammals to speed up their reproductive cycle, eliminating key longevity genes. de Magalhães ...

RANGELY, Colo. — University of Colorado Boulder announced Wednesday that a team of paleontologists working in the northwest corner of Colorado have discovered a "swamp dweller" that was alive during ...

More mammals were living on the ground several million years before the mass extinction event that wiped out the dinosaurs, new research has revealed. More mammals were living on the ground several ...

When I think about dinosaurs, I usually picture the big ones. I think of triceratops with its pointy horns or apatosaurus with its long, long neck. I asked my friend John Blong if those dinos ever ...

Zebra stripes? Leopard print? Neither were in vogue among the earliest mammals during the Age of Dinosaurs. Early mammals and their close relatives probably sported dark, drab coats from snout to tail ...

NEW YORK — An unusual find in China suggests some early mammals may have hunted dinosaurs for dinner. The fossil shows a badgerlike creature chomping down on a small, beaked dinosaur, their skeletons ...