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Re: Do we have dromaeosaurid evolution backward?

David Marjanovic <david.marjanovic@gmx.at> wrote:
>>  As I see it, one major problem with this idea is that if large,
>>  pennaceous feathers originally evolved for aerodynamic purposes,
>>  these feathers are unlikely to have arisen in "large" (2-4m long)
>>  theropods that used their forelimbs for catching prey.
> I suppose that's where Hopp & Orsen (1998) come in.

Using the forelimbs to help incubate eggs might explain the presence
of big pennaceous feathers.  But it doesn't explain why those feathers
would be aerodynamic.  Or else, this step (bipinnate, aerodynamic
vanes) arose at least twice.