A tooth fragment found in the skull of a fossilized dinosaur sheds light on the Tyrannosaurus rex’s feeding habits.

The oceans of the Cretaceous of North America teemed with life. Gigantic fish and enormous marine reptiles hunted the Western Interior Sea. A unique new fossil demonstrates rare evidence of direct ...

Along with its copper-colored head and catlike vertical pupils, the copperhead is the only species of snake in Delaware that ...