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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
P.O. Box 20840
Flagstaff, Az. 86011
"A _Coelophysis_ with feathers?"
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