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RE: Shenzhouraptor--additional info

Ben Creisler wrote:

> Qi seems to suggest there were TWO types birds that 
> evolved from theropods--

A diphyletic Aves?  Isn't this what Kurochkin is on record as proposing?

Well, it's been suggested for bats...

> birds that achieved flight from 
> the trees down and birds that achieved flight by running.

As Padian and others have pointed out on many occasions: the two scenarios
are NOT mutually exclusive.  In fact, the most primitive birds and most
primitive deinonychosaurs are built like they were adept at both running and



Timothy J. Williams, Ph.D. 

USDA-ARS Researcher 
Agronomy Hall 
Iowa State University 
Ames IA 50014 

Phone: 515 294 9233 
Fax:   515 294 9359