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Re: Feathers for S excretion (very long)



-----Original Message-----
From: David Marjanovic <david.marjanovic@gmx.at>
To: The Dinosaur Mailing List <dinosaur@usc.edu>
Date: Saturday, March 24, 2001 9:55 AM
Subject: Feathers for S excretion (very long)


>There seem to be some misconceptions on this hypothesis onlist. First,
>nobody says feathers evolved for sulfATE excretion -- this is water soluble
>and totally unproblematic AFAIK.


But,.....if the protobird lived in an arboreal enviornment, and was
developing protofeathers for insulation, this would indicate a non-tropical
enviorn, with only occasional rainfall. Under such conditions, it would make
sense for the development of longer scales for this sulfate excretion, as
there was not sufficient water available to get rid of it in liquid urine.

 Seems to present itself as a good arguement >>for<< the trees-down
scenario,...no???