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Re: ABSRD BAND on Sinornithosaurus feathers

George Olshevsky wrote:

Evolutionarily speaking, an
animal cannot know that feathers will be good for insulation until >after it
evolves them; thus insulation cannot be the >reason< for the evolution > of feathers.

Why not? Even a microscopic layer of peach-fuzz-like integumentary structures would act as a heat-trapping surface. The seeds are sown for further selection.

Are you likewise suggesting that mammalian hair originally evolved for a purpose other than insulation?

More intricate feathers are likely the result
of feather evolution after exaptation of the peach-fuzz for other >functions.

This I agree with, 100%.



Timothy J. Williams

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

Phone: 515 294 9233
Fax:   515 294 3163

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