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Re: Horner's Pachy Lumpin' - Your Thoughts?
> From: Brian Baziak <email@example.com>
> Subject: Re: Horner's Pachy Lumpin' - Your Thoughts?
> To: firstname.lastname@example.org
> Date: Thursday, January 7, 2010, 11:46 PM
> And the huge dome that grows isn't a
> sexual display feature?
1.) The dome has functional value outside of display (agonistic behavior).
2.) Stygimoloch, even assuming it was just a P. wyomingensis juvenile, already
has a (laterally compressed) dome. It's not just a feature that develops upon
reaching the full-grown "Pachycephalosaurus stage."
3.) Even if the dome was purely for show, it would still be curious that other
apparent sexual display features already eroded away before it fully developed.
I don't know of a single example of such in the animal kingdom where a taxon
uses one type of sexual display in adolescence, but later loses it and
replacing it with another at full physical maturity. But I guess it's possible
even if unlikely.