well i'm gonna have to look but i watched it on t v and read it in a book that t rex was more robust just meaning that it was more heavily built or more muscular than giga it's that a little misleading though diplodocus is longer than brachiosaurus but it's not larger or heavier than brachiosaurus yeah i can't argue about it's skull length it does have a big head which is kinda funny considering t rex has the largest tooth size than any other carnivore mcelite