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Re: Olfactory Lobes & Large Yixian Theropods (was Re: New here, General Qs)
> Bradley Fischer wrote:
> >2. How does T-Rex brain structure compare with Dromeosaurs and other
> >small theropods?
As expected, it's considerably more birdlike than that of
> >On a different topic: In a fairly recent issue of Scientific American,
> >there is an article about the evolution of feathers and their
> >beginnings on theropods. The article suggests that even T-rex probably
> >was feathered. Only problem I have with this theory is that the subject
> >sample is all from china and they found no large theropods with
> >feathers. Anyone care to comment on this? Am I off on my thinking?
Yes. Take phylogenetic bracketing into account. It would be rather
surprising if *T. rex* was completely featherless throughout its life
cycle -- though of course this is not directly testable at the moment...
if it's true that at least some specimens that are currently called
*Sinosauropteryx* are less closely related to birds than *T. rex*, which
seems to be the case.
> Sadly, there are not yet any large theropods recovered from the Yixian
> Formation. Come to think of it, off hand, I can't think of any large
> vertebrates from the Yixian. If there are, could someone please list
> them with length and mass estimates?
Search the archives for *Jinzhousaurus*. (Preferably without asterisks or
anything.) It's an "iguanodont" of reasonable size.
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