A fossil unearthed in Argentina of a newly identified species of meat-eating dinosaur is providing insight into a poorly understood group of Cretaceous Period predators, thanks not only to its extensive skull remains but also to the remarkable object that it still had clutched in its jaws - the leg of a croc.The dinosaur, named Joaquinraptor casali, lived roughly 67 million years ago in what is now central Patagonia at the twilight of the age of dinosaurs, measuring approximately 23 feet (7