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Re: If dinosaurs could fly...

Martin Human wrote

>Supposing down feathers first evolved as insulation for an
>(semi?)aquatic dinosaur/bird?
>Even an endotherm needs insulation in water, with a heat loss rate >25
>times that in air...
Larry Martin has speculated that Sinosauropteryx might have been aquatic,
although he doubts the filamentary structures were external. I don't think
his ideas have been published. -- Jeff Hecht