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bird arms



What is the correct position for the arms and hands of animals such as Caudipteryx or Sinosauropteryx?
 
If the radius and ulna of these animals could not cross then surely the birdlike posture with the arms tucked back is not possible.
 
Which leads me to ask whether birds can cross their radius and ulna to create rotational wing motion during flight, or to fold them away.
 

Gav
 
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