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Re: _Parasaurolophus'_ crest and how much we can't deduce from it.
> Can someone offer me comment on this [perhaps silly] notion of mine, that
> hadrosaur nostrils might at least in part have been sophisticated
> water-retention devices? In this group it seems awfully certain that
> their primary function was as trombones, but my experience suggests that
> many, if not most, signalling structures are elaborated from those in
> which more physiological functions originally predominated.
> Many thanks.
> John C. McLoughlin
if Parasaurlophus was trying to conserve water through
condensation, the purpose of the nasal passages would be to increase
surface area, right? But it's an incredibly inefficient way to do that. A
much better way is to use thin, highly folded sheets of bone, if you want
to increase surface areas (is this what the whole respiratory turbinate
thing is about?). Parasaurolophus does have a lot of nasal surface area,
but it's a really wasteful way to get it. I have no idea what the
original purpose of duckbill nasals are, but in Parasaurolophus, the
purpose of the crest is to increase the length, not surface area, of the