User blog comment:Lachlan Blake/Wassboss and LB's prehistoric battles: T-rex VS Suchomimus!/@comment-422690-20110801223429/@comment-422690-20110801235032

I'd assume it uses it's neck and head to do some balancing act. Not entirely sure (my interest in dinosaurs died out at age 10 or so), but having every T-rex going "I've fallen and I can't get up!" seems to be an evolutionary design flaw, so this conjecture makes the most sense. To me, at least.