The Giganotosaurus looks very similar to the T-rex. Both were dreaded hunters, had very short arms, walked on two legs and had a large skull. However, the Giganotosaurus lived much earlier and w...

Giganotosaurus juveniles lived in packs and quickly grew up to be dangerous hunters. Giganotosauruses grew to be almost as large as the biggest carnivore in the history of the earth: the Spinosaur...