Until now, estimating how old a dinosaur was when it died has been a fairly simple process — just count up the growth rings in its fossilized bones. "We always thought that those rings were formed ...

Paleontologists in Argentina have discovered a new predatory dinosaur -- the fossils of which contained a crocodile bone within the dinosaur's mouth. The new species, dubbed Joaquinraptor casali, is ...

Add Yahoo as a preferred source to see more of our stories on Google. A rare fossil of Joaquinraptor casali from Patagonia reveals a powerful predator that may have dined on crocodiles. (CREDIT: The ...

A dinosaur that may have been one of the fiercest of the Cretaceous period has been excavated in South America – with an extinct crocodile’s leg in its jaws. The remains of the dinosaur, named ...

Add Yahoo as a preferred source to see more of our stories on Google. Paleontologists in Argentina have discovered a new predatory dinosaur -- the fossils of which contained a crocodile bone within ...

A fossil from the blustery plains of Patagonia is revising your book on one of the most elusive bands of hunting dinosaurs. The newly discovered dinosaur, Joaquinraptor casali, preyed on the soggy ...