In the Late Cretaceous, the region of South America that would one day become modern Argentina was a dramatic land indeed.

Paleontologists have found a massive dinosaur footprint, measuring a full 92 centimeters (roughly 35 inches) across. This colossal footprint hints at the existence of a truly gigantic dinosaur – ...

WASHINGTON, Aug 15 (Reuters) - Tyrannosaurus subdued prey with raw power, using bone-crushing bite force. But other meat-eating dinosaurs that rivaled T. rex in size used different approaches.

WASHINGTON (Reuters) -Tyrannosaurus subdued prey with raw power, using bone-crushing bite force. But other meat-eating dinosaurs that rivaled T. rex in size used different approaches. Giganotosaurus ...

Caption: A Giganotosaurus, even larger than T. rex, will star in "Prehistoric Predators," a blockbuster summer dino exhibit opening May 22 at the Oregon Zoo. Photo by Michael Durham, courtesy Oregon ...

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Khankhuuluu mongoliensis was slender with features like no other member of the tyrannosaur family tree. This illustration depicts how the slender Khankhuuluu mongoliensis may have appeared as it ...