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RE: Campbell's even crazier than a MANIAC? (archeopteryx



> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] 
> On Behalf Of David Marjanovic
> Sent: Wednesday, September 24, 2008 4:42 PM
> To: DML
> Subject: Re: Campbell's even crazier than a MANIAC? (archeopteryx
> 
> > If its not gliding/slower falling before powered flight, what good 
> > does a stubby wing with stubby feathers do?
> > WAIR? how would that behavior start with normal forlimbs?
> 
> Half a wing is great for brooding. Search the archives for 
> that word, perhaps together with the name of Thomas Hopp (who 
> has weighed in on this list a few times). You're in for a surprise.
> 
> And if you don't like that, you can always waffle about display! :-)
> 
> The idea that wings must have evolved for flying is actually 
> not logical at all... 
> 

Additionally, the main point of the original WAIR paper is that the stepwise
increase in wing development (both natural ontogeny and articially
manipulated feather size aka clipping, trimming, and control) shows a
stepwise increase in the angle of potential ascent up a surface. So a little
big of fringe gives a little benefit; selection for larger fringe allows
access up steeper surfaces, etc.

And, of course, none of these had "normal" forelimbs (if by that you mean
only scaled). These were the descendents of fuzzy animals already with some
fringed arms, and additionally Maniraptora is characterized by the elongate
arms with "tuckable" hands.

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216                        
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/
Fax: 301-314-9661               

Faculty Director, Earth, Life & Time Program, College Park Scholars
http://www.geol.umd.edu/~jmerck/eltsite/
Fax: 301-405-0796

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA