I think Jack Horner and John Scannella is going a little bit too far on this. Firstly, post-cranial material (fossil material that does not belong to the skull) of Torosaurus indicates that Torosaurus is 7.6 meters long, smaller than the 9 meter long Triceratops (I wonder whether John Scannella and Jack Horner even knows how small Torosaurus actually is compared to Triceratops). One of the only animals (if not the only) which shrink as they grow up is the paradoxical frog, and dinosaur species (eg. Allosaurus, Triceratops’s relatives Protoceratops and Centrosaurus) which fossils of nearly all ages found indicates that NO dinosaur grows up like that! Not only that, Horner and Scanella’s theory suggest that the solid frill in Triceratops grew the 2 holes on it’s frill as Triceratops mature. If that’s the case, why would they grow a solid frill in the 1st place if they would grow 2 holes on it’s frill in later life? I also think that Mark Goodwin and Jack Horner's theories on the Pachycephalosaurs are just as absurd. For Stygimoloch, it is highly unlikely that it grew spikes behind it's dome if they were to shrink in later life as that would be a waste. As for Dracorex, this webpage proves that like Stygimoloch, Dracorex IS NOT a Pachycephalosaurus: http://www.thedracorex.com/dracorex-faq.html