"Many of them had feathers, [so] they could insulate themselves just like mammals can," Brusatte said. In addition, some dinosaurs, such as Tyrannosaurus rex, were likely warm blooded, research finds, ...

A video that has been making rounds on social media all week shows two bewildered-looking bighorn sheep crossing Palm Canyon Drive.

Some were the size of a dog. Others were as large as polar bears. A newly-discovered fossil of the ferocious hyaenodont is ...

The end of the Cretaceous Period, 66 million years ago, marked the dramatic extinction of the dinosaurs. Until now, our ...