since nobody luvs Saurophaganax - or you are on Xmas "break" -

[Hammer <hammeris1@att.net>]

Has anyone considered whether or not large theropods had to learn to beware of 
thagomizers and tail-clubs the hard way, or was an instinctive gene passed on 
to take precautions when sizing up a stego or ankylo for dinner?