Jack Horners Shape shifting dinosaurs

I agree with  you. There was also Dienonychus

You mean Dromeaosaurus right? Deinonychus alive far before the late Cretaceous. 

That's what I meant. I usually get those two confused.

just read a newly discovered raptor, Acheoraptor that lived at that time. But my main point was i just don't believe dinosaurs drastically changed as they got older, as jack horners' theory suggests.

I agree. When I watched it made my think, because Jurassic Fight Club featured an episode about a Nanotyrannus that was killing baby T-Rexs. I thought how was that possible. Why would baby T-Rexs be killing each other? When they play they weren't that violent towards each other. In that respect NanoTyrannus has to be a seperate species. Also Paleontologists have found baby and juvenile T-Rexs fossils before and they don't much NanoTyrannus fossils. In conclusion NanoTyrannus has to be a seperate species.

Peter Larson had CT scans of Nanotyrannus and Tyrannosaurus taken, and the brain cavitiy of Nannotyrannus had a completely different orientation that of Tyrannosaurus.

It was also shown that nanotyrannus carried it's head differently then Tyrannosaurus.. I don't think head orientation would change with age..

I agree with that too.

glad someone does! :P

First off, I'm one for NanoT being it's own species too.

Second, if you haven't noticed, but over the course of the Mesozoic, there were primarily 3 sizes of meat eating dinosaurs in any given area. Lots of little ones, a few medium ones, and a couple large ones. But when Late Cretaceous North America rolled around, things were very different. There were only 2 sizes of meat eaters. Really big tyrannosaurs, very small raptors(and NanoT), and nothing in between. There were no more jobs for the medium sized meat eaters, because T-rex was basically eating everything.

As far as herbivores go, there were dozens of them. Triceratops, Torosaurus, Styracosaurus, Ankylosaurus, Edmontosaurus, Parasaurolophus, Corythosaurus, Alamosaurus, Pachycephelosaurus, and Stegoceras just to name a few. Just like every healthy ecosystem, the herbivores outnumbered the carnivores.

yes, the herbivores out numbered the carnivores no doubt. But my main point was Jack Horner seems to think, for example, Torosaurus is just a very grown up triceratops. And stygimoloch and dracorex (stegoceras?) are Juvenile and Sub adult Pacheycephalosaurus. i Just don't believe  this. Sure Hadrosaurs were diverse with many species in North America, with the occasional ankylosaur and Sauropod...but i don't believe There was one Ceratopsian, one pachycephalosaur.

Neither do I and most scientists don't think that either. There were enough differences between Triceratops and Torosaurus to classify them as different species(for one thing Triceratops was bigger than Torosaurus, so it seems strange that Horner would believe Triceratops to be the juvenile). The same goes for the pachycephalosaurs. There are enough differences. 

PS- Why did you put a ? next to Stegoceras? Just curious.

It may be the other way around, i'll look it up real quick. I knew for sure stgymoloch and Dracorex were included in that debate..not sure if stegoceras was. 

Horners' theory says that Stygimoloch and Dracorex lost their bumps as they aged and traded them for the big dome. I don't believe radical changes occured like this..

It's the same arguement for Nanotyrannus being a young T-rex. Yes, some changes take place as animals grow. But not that big. Especially when it comes to bone/skeletal structures. Fleshy/cartilaginous structures are one thing as they can be "molded" easily. Bone is another.

All are very good points... and I do agree with you. However, it's my own belief that Nano-T was just a different juvenile Rex. I know the skeletons are "somewhat" different, but, hey, even Tyrannosaurus skeletons all are different between them.

BTW, you don't need to think like me. Even I see that as only a theory, and a not very strong one (in fact, that's how I classify in my mind a Nano-T when I see one: as a juvenile T-rex). But I absolutelly agree with you on all the others!