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Tyrannosaur arms

      How many tyrannosaur species have known arm material attributed to 
them?  My impression is that T.rex is the only tyrannosaur with 
especially powerful arms, and it was also one of the very last 
tyrannosaurs.  Perhaps tyrannosaurs were loosing the arms altogether as 
thier skulls became more powerful, and then T.rex found a new use for its 

LN Jeff