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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.