Mammals and dinosaurs coexisted on Earth until a catastrophic event 66 million years ago killed 75% of life on the planet.

Learn about a small rodent-like mammal whose descendants survived the extinction event that killed all non-avian dinosaurs.

A newly discovered prehistoric mammal may hold clues to how life survived the dinosaur-killing extinction. The tiny species, ...

Scientists have identified a new prehistoric mammal species, Cimolodon desosai, from a rare fossil in Baja California that ...

These mammal pioneers were contemporary with ferocious Triassic dinosaurs such as Staurikosaurus and long-necked herbivores like sauropodomorphs. There was a lot to lose. Already in the Late ...

This is an archived article and the information in the article may be outdated.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 ...

After the extinction of dinosaurs came the age of mammals. A new book brings readers into this world with well-researched species profiles by Aaron Woodruff, collection manager for vertebrate ...

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 ...