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It is possible that adult Pachycephalosaurus did not reabsorb the posterior
cranial horns, short spikes may be characteristic of one sex. There is not
a sufficient sample size to tell. It is also possible that only one sex of
Triceratops grew the long Torosaurus type frill, which could explain why some
really big skulls such as the Los Angeles example retain the short upturned
frill. Will take more specimens and analysis to sort it all out.