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the unkillable hadrosaur thread

Since nothing else seems a satisfactory explanation, perhaps we should
take another look at the tail-thwacking theory of hadrosaur defence. 
Some people objected to the idea because it would be likely to cause
severe tail damage even if it worked--but then, Darren Tanke pointed
out a few months ago that broken tails were frightfully common among
hadrosaurs, and often rehealed with kinks in them.  (He was hoping
somebody would illustrate kink-tailed hadros.)  So, is the observed
tail damage consistent with what could be expected to result from
using the tail as a bludgeon?