There it is, the biggest land predator ever in South America: Giganotosaurus.
— Allen Johnson, about Giganotosaurus
in Land of Giants

Giganotosaurus ("Giant Southern Lizard") was a giant, predatory, South American dinosaur from the Early Cretaceous period. It was one of the largest theropods to ever live, the second largest known Theropod, after the gigantic T. Rex itself. It measured 14 meters long, stood over 5 meters tall, and weighed 67 tonnes. Only Tyrannosaurus Rex is larger, at a maximum of 15 meters long and 7 tonnes. Allosaurus and other Allosaurids were close relatives of Giganotosaurus.



Giganotosaurus lived in South America during the Early to Middle Cretaceous period from 12795 million years ago. It was the top predator of its time and hunted just about anything in its environment, from as small as Iguanodon to as large as Argentinosaurus. Most Giganotosaurus fossils have been found in parts of South America where Argentina is today.


Although almost as large as Tyrannosaurus Rex, Giganotosaurus was the biggest predator of its time. These huge carnivorous dinosaurs were very big, as they stood 1618 feet tall, measured 4346 feet (1314.2 meters) in length, and weighed up to 67 tons in weight, making Giganotosaurus one of the largest predatory dinosaurs that ever walked planet Earth, second after T-Rex itself.

In addition, Giganotosaurus looked very similar to the Jurassic predator Allosaurus, despite the fact that Giganotosaurus was even larger.


Like many predators, Giganotosaurus was a pack hunter, hunting in numbers of five or six individuals. They also often hunted alone, but when solitary, they only hunt animals like Iguanodon, because a single Giganotosaurus would have a lot of trouble taking down a fully grown Argentinosaurus by itself.

But working in a team however, Giganotosaurus could tackle large prey, even ones as big as dinosaurs like Argentinosaurus, which were the biggest herbivores in Giganotosaurus's environment. Once they brought down and fed on an Argentinosaurus, even if it was a young Argentinosaurus, the Giganotosaurus pack wouldn't need to feed again for a few months, at least two or three.

These big dinosaur predators, they waited for the herbivores, just like crocodiles waiting at river crossings in Africa.