Mammals have existed for 170-225 million years and some ancient mammals that lived alongside dinosaurs were called ...

Although they came into their own only after the extinction of the dinosaurs some 65 million years ago, mammals had maintained a low-profile existence for some 150 million years before that.

Evidence suggests that “the precursors to the dinosaurs and pterosaurs were much more diverse than previously imagined.” ...

Faced with an evolving group of competing organisms -- the mammals -- perhaps dinosaurs were driven to extinction by competition. Packs of small mammals would have competed with dinosaurs for food.

The fight scene, preserved in a fossil discovered in China, suggests that small mammals preyed on the dinosaurs that ruled Earth during the Cretaceous period more than previously thought ...

Before the asteroid hit, Steve described mammals as “staying and diversifying in the shadows” while dinosaurs “eventually took over from the crocodiles, got bigger and spread around the ...

“Every nook and cranny and bump that occurs on a bone can tell us something about where the muscles or tendons attached and ...

Paul says, 'Sauropods were the only group that were heavier than the largest land mammals. 'Interestingly, theropod dinosaurs such as Spinosaurus and T. rex were also the only animals to exceed the ...

So far, what Gondwanax and its fellow silesaurids reveal is that the rise of the dinosaurs wasn’t a sudden, dramatic event.

After the extinction of dinosaurs came the age of mammals. A new book brings readers into this world with well-researched ...

A fossil, believed to be one of the oldest ever, could help explain the rise of the dinosaurs. Scientists in Brazil announced ...