sciencehabit writes Researchers working in Argentina have discovered the most complete skeleton of a titanosaur, a group of gigantic plant-eating dinosaurs that dominated the Southern Hemisphere beginning about 90 million years ago. The new dino, named Dreadnoughtus schrani, was 26 meters long and weighed about 59 metric tons—that is, twice as long as Tyrannosaurus rex and as heavy as a herd of elephants. That puts it on a par with other well-known giants such as Argentinosaurus (but it's four times as large as the perhaps better known Diplodocus). The researchers say that the beast was so big it would have had no fear of predators. And it was about to get bigger: A close examination of the fossils, especially its back and shoulder bones, indicates that the animal was still growing when it died.