Long before it became a desert, Patagonia, in Argentina, was a thriving dinosaur hangout. Paleontologists have found a wealth of dinosaur eggs and fossils there in recent years. In uncovering what may be the largest dinosaur ever. The 150-foot plant eater would have weighed more than 20 cows! Philip Currie helped uncover another giant last year: a 45-foot-long, 9-ton beast that may have been the biggest meat eater ever to walk the earth. That Currie found a group of at least six suggests that these monsters hunted in packs.