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Re: S-curves in dinosaur necks?

out of curiosity, did all dinosaurs have an S-curve in their necks?...

Basically... yes, all whose necks weren't too short or something had an S-curve, to varying degrees.

or were those restricted to the therapods?

Remember: This is the wrong place to spell "theropods" with "a".

ie, if an ankyosaur(sp) or ceratopsian ever evolved sans the frill and-or
head armor, and had a longer neck, would it possess an S-curve (like a
swan), or would it be stiff (like a giraffe), or something else?

It would have an S-curve. Though not like a swan. More like a *Plateosaurus* (try to find a pic).

for those wondering, this line of thought comes from a crackling
sound in my neck.