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RE: How did dromaeosaurs use their arms?

Matthew Bonnan writes:
> great for walking/running forward in a straight line, but is less great
tight turns just because of the physical geometry of the hip socket and 
femoral head.  Feathers on the arms, as well as a long, stiff tail, may have

allowed a terrestrial predator with less mobility in its hips to compensate 
for this by incorporating the forelimbs and tail in turning, etc. 

How do you survive as a predator who can only run in nearly straight lines
_until_ you develop the extra mobility?

cheers, martin