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Though I shouldn't really be sending this since I have not yet read the
Scientific American articles I can put some input into this.
Depending on where the bird is standing the posture changes. If the
bird is perching, the bird is in a semi-vertical to vertical posture.
While it is on ground is a different matter completely... Depending on
the weight of the hindlimbs and the ability of the forelimbs to fold,
the posture can be horizontal to near-vertical. Let me point out
something, Confuciusornis coud fold its forelimbs and this >could< bring
the body in a vertical posture. Look at Pennycuick's work in regard to
the posture and locomotion of pterosaurs, he showed that Archaeopteryx
could stand in a vertical posture concieveably.
More when I get the articles.....
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