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RE: Air sacs in extant non-avian reptiles?

        elurio wrote:
> That's because they both lack the singular trait that makes tetropods,
> toes. 
Oh fantastic!  I've wondered for years and years what the one true defining
trait of tetrapods was. Toes!  Who'd have guessed?

Lauri L. Bartlema
Curatorial Assistant
Conservation Division
Directorate of Environment
Fort Bliss, Texas