Giganotosaurus was one of the largest theropods to ever walk the Earth, living during the Late Cretaceous period around 98 million years ago in what is now Argentina. Reaching up to 43 feet in length and weighing nearly 8 tons, this massive predator was larger than Tyrannosaurus rex, though it had a more slender build built for speed. Its serrated teeth and powerful jaws made it an efficient hunter, likely preying on large herbivores like Argentinosaurus. Unlike T. rex, Giganotosaurus had a longer skull and three-fingered hands, suggesting a different hunting strategy. As one of the top predators of its time, this fearsome carnivore ruled the South American landscape before the rise of even larger titans.