T-Rex was was a smart dinosaur. It usually lived alone and laid eggs. It lived during the Cretaceous period, which was approximately 165 to 145 million years ago. The Tyrannosaurus Rex was a predator, which means it was a meat eater. It's bones were once arranged so that it stood upright, proped on its tail.
New research indicates that it most likely stood mounted on two feet, in a stalking position.