Paleontologists come to the plains around Plaza Huincul searching for clues to a prehistoric world.This place was once home to the most extreme dinosaurs ever seen.Dinosaur hunter Rodolfo Coria knows he is a lucky man.He is chief paleontologist here and many of the most extraordinary finds have been his.Argentina is a good place for finding fossils, especially because of Patagonia.Patagonia is almost 50 per cent of the Argentinian surface, and the rocks, they are very well exposed.So it is very easy to find fossil evidence on itIf you are looking for dinosaurs, Patagonia is the place.But even Rodolfo was unprepared for the series of record-breaking monsters he was to unearth in these rocks,dinosaurs which would change our picture of the prehistoric world.It all began nine years ago, when he and his team began excavating the bones of what was obviously a very large dinosaur.