T- Rex is a Tyrannosaurus - say "tie-RAN-oh-sore-us" - and is about 12 meter long. That's about the size of one and a half buses! T- Rex likes to eat meat, which we call a carnivorous diet. T-Rex's appetite for steaks is one of the reasons why he has 60 super sharp and pointy teeth! T-Rex lived in what we now call Canada and the United States of America.