Dear Olga,
One advice more.
I think, the first, that you should make - is the contact with Zoological Institute of the Russian Academy of Science in St.-Petersburg. Andrey Panteleev is engaged paleoornitology there. There are skeletons of almost all specieses of birds which live on the Earth in collections of institute .
It is possible to discuss your problem with him.
E-mail: [log in to unmask]
Sincerely, Alexey
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