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Re: Cheekless and lipless dinosaurs -- a haven for germs?

Sorry to clutter the list with this, but...

I wrote:
> So here goes: do cheekless and lipless _terrestrial_ animals have a
> hygienic selection pressure for lips or cheeks, or is this no problem? 
Is
> there a doctor in the house?

Of course, the above makes a lot more sense if you remove the phrase
"cheekless and lipless".  I am not _trying_ to be absurd.  I'm just
wondering: why do lizards have lips?

-- Ralph Miller III     gbabcock@best.com