Giganotosaurus

Giganotosaurus is a giant from Patagonia that lived during the Late Cretaceous Period. It was 30 million years before Tyrannosaurus Rex. "Giant southern lizard" was 13.4 meters long and about 8 tons weight. It was bipedal predator with brain the size of banana. It had huge jaws that was 1.8 meters long. It had 8-inch long serrated teeth that slashed meat.

Giganotosaurus from the Patagonia region of Argentina (in southern Argentina), which was originally (in 1994) found by a local auto mechanic whose hobby is hunting dinosaur bones. In honor of the discoverer, Ruben Carolini, the huge dinosaur has been named Giganotosaurus carolinii. It was named by Coria and Salgado in 1995.

Giganotosaurus was a perfect runner. Its slim tail provided great balance and mobility. In 1995 James Farlow of Indiana-Purdue University argued that a large T. rex could run no faster than 20 mph (32 kph), because if it did, a fall would probably be so severe as to kill it. T. rex weighed about 6 tons and was up to 20 feet (6 m) tall but Allosaurus was slightly smaller, about 3 tons and 16.5 feet (5 m) long. Farlow says that Rothschild's analysis is consistent with his theory since Allosaurus was smaller than T. rex (its smaller mass would make the impact much less powerful so the animal may have been able to recover after a running fall). Giganotosaurus and T. rex were quite similar in size, so Giganotosaurus may or may not have been a fast runner.