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. This image shows an artist's illustration of the newly discovered dinosaur Joaquinraptor casali with an ancient crocodile relative ...

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 ...