They're huge! Like, up to 20 feet high, and these T-Rexes—oh, that's a type of dinosaur, by the way—have canine incisors to tear the meat apart. Their arms aren't very long, though, weirdly enough. Maybe they just didn't need it much, like, they're too busy being badass just ripping stuff off with their teeth to bother with hands. [Also he might have wanted to build a mechanical T-Rex and that dream has not yet died]