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questions in birds evolution

To: dinosaur@usc.edu
Subject: questions in birds evolution
From: siriraks arrathrakorn <arrathrakorn@yahoo.com>
Date: Sun, 15 Nov 1998 03:38:28 -0800 (PST)
Reply-to: arrathrakorn@yahoo.com
Sender: owner-dinosaur@usc.edu

I interesting in evolution of bird. 
I'd like to asked some questions.

1. what is postcranial structure? (as in confuciusornis paper) and why
this evident predicted the climbing tree trunk behavior?

2.what is haemal spine ? (as in sinosauropteryx)




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