Giganotosaurus

Giganotosaurus ("giant southern lizard") is currently one of the largest known meat-eating dinosaur ever. For many years Tyrannosaurus held that record (although bits and pieces of Carcharodontosaurus and Spinosaurus showed that they were as large as any individual T-Rex). Then, in 1995, paleontologists Rodolfo Coria and Leonardo Salgado reported the discovery of a new meat-eater bigger than any tyrant lizard. They named the giant dinosaur, ''Giganotosaurus carolini. ''

Bone for bone, it was larger than the largest skeleton of T-Rex ever found! The skull alone was 6 feet (2 m) long! What's more, a lower jaw bone was later found from an individual even bigger than the first one - with a skull perhaps 6 feet (2 m) long. Clearly, Giganotosaurus was a gigantic dinosaur.

When Giganotosaurus was alive, the most common plant-eaters in South America were the Titanosaur sauropods. While a single Giganotosaurus could kill a young Titanosaur, it would take many Giganotosaurus to bring down a giant adult. Originally, there was no evidence that Giganotosaurus hunted in groups, but a recent discovery from slightly younger rocks shows that they indeed may have lived in packs of 6-12 or more individuals.

More real-life information: Giganotosaurus on Wikipedia.

Appearance
The Giganotosaurus appears as a giant gray-skinned carnivore with three fingered hands and many teeth. It is less bulky in comparison to Mama Scarface. This dinosaur also has bony crests above it's eyes and it has a longer more narrow skull than a Tyrannosaurus. After this brief appearance it is never seen again as it presumably stays in it's territory of Death Valley for all of it's life. It has no offspring but there are skulls in the valley that match the Giganotosaurus' skull hinting at past generations that were wiped out by predators. (Ex. Utahraptors). It is presumably the last of its kind.