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>> In a message dated 97-12-08 03:10:05 EST, JSeward wrote:
>> form of insulation would be naturally endothermic. Could it be that feathers
>> had the primary use of flight and the secondary use of insulation for those
>> birds? If so, that seems to indicate something about the environment of that
>> time. The Jurassic environment was hot and tropical, right? So maybe
>> endothermic metabolisms were not needed for those birds (and dinosaurs by
>> extension).
>That makes the *symmetrical* feathers on _Protoarchaeopteryx_ a bit 
>difficult to fathom, doesn't it? 
>Just my 2c.
>Ilja Nieuwland
Not if it was a swimmer. A new specimen has been found with gastroliths. This 
could weigh the animal down, and maybe it 'flew' underwater like some liveing 
birds do today.