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

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This is an archived article and the information in the article may be outdated.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

Mammals may struggle to attain long life thanks to dinosaurs. According to University of Birmingham microbiologist João Pedro de Magalhães, the age of dinosaur dominance completely shifted the ...

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 ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Scientists uncovered over 70 newly discovered species, including mammals, dinosaurs, insects, fish, and more—some discovered ...

For more than a century, paleontologists have treated dinosaurs and mammals as rival success stories that simply took turns ruling the planet. New work on how each group raised its young suggests the ...

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 ...