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Re: rex scavenge

This list may have been over this before, but I was under the 
impression that Tyrannosaurs had conical teeth with specialized 
serrations.  I don't see these as weapons for crushing bone, but 
built to bite thru them without breaking.  Crushing and eating bone 
requires not only powerful jaws, but specialized dentition like 
hyena.  Lions cannot get at marrow in large bone.  Is this correct?

Is this why nodosaurs and ankylosaurs developed such serious back, 
neck, and head armour?