[wow these things sound like monsters or demons or something jesus --]

Huh... I wonder why, then. Maybe just for display purposes? It's not like you can put a live creature in a museum or anything, unless it's a zoo. [but.. yeah..]

But yeah, t-rex! They're extinct now, but they're a type of animal -- or more specifically, a dinosaur -- that existed waaaay before our time. They're huge though, and I doubt humans would be able to survive with a predator like that existing, anyway.