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Re: bird arms

Gavin Rymill wrote:
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.<
My (basic) understanding of bird wing motion is that all rotation takes place at the shoulder. I could be wrong though.

Student of Geology
Northern Arizona University
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"A _Coelophysis_ with feathers?"

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