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Tyrannosaurid arms (was RE: Forelimbs of "Terror Birds")
Dann Pigdon wrote:
>"Williams, Tim" wrote:
Yeah, I gotta change my name address. This just won't do. Darn server...
>Then there is my suggesting (it may not be original): that the forelimbs
>weren't used much at all in adults, but that they were relatively larger
>in juveniles. An adult tyrannosaur could pretty much rely on that
>awesome mouth. Juveniles, who may have had quite different hunting
>strategies while small (as with Komodo monitors), may have used their
>relatively larger forelimbs to a greater degree.
So adult tyrannosaurids outgrew their forelimbs? This scenario begs the
question: why did tyrannosaurids have only two fingers? (Setting aside, for
the time being, George's view that didactyly was an aerodynamic adaptation
in the tyrannosaurids' flying ancestors, a la BCF.)
And even your juvenile tyrannosaurids have rather short arms - at least by
>Note that this isn't based on any actual research on my part.
What!!?? People still do "research"?
Which brings me to the _Discover_ article on claw-winged phorusrhacids.
Like Nick, I found the original (scientific) article describing the manus
configuration of _Titanis_ - but found no mention of a manual claw. I
assumed it had been described elsewhere, and so I kept on looking for the
source. So far, no dice. Maybe it's all just a leap of somebody's
imagination which, over time, has solidified into "fact". It happens.