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Tyrannosaurus ?

 I have heard that because of the great differences in male and female 
Tyrannosaurus Rex that it may be two different speices altogether.  T. Rex and 
T. X.  Could this be true or is it a myth.

Another question concerning T. Rex is its top speed.  I have seen in some older 
books that T. Rex was very slow (3-5 mph), but in some other book T. Rex is 
said to have been rather fast (30-35 mph).  Where did these completely 
different speeds come from?

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