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On Oct 13, 2009, at 6:23 AM, GSP1954@aol.com wrote:
It is possible that adult Pachycephalosaurus did not reabsorb the
cranial horns, short spikes may be characteristic of one sex. There
a sufficient sample size to tell. It is also possible that only one
Triceratops grew the long Torosaurus type frill, which could explain
really big skulls such as the Los Angeles example retain the short
frill. Will take more specimens and analysis to sort it all out.
If by "the Los Angeles example" you mean the one in the atrium, that's
supposed to be Triceratops prorsus, interestingly enough...
(I got fairly familiar with the critter recently, since I got married
in front of it and the Tyrannosaurus a couple of months ago.)