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Pelvis from some sort of cormorant:
https://www.flickr.com/photos/jrochester...
I think (!) this may be the hips of a bird of some sort...? Not sure. That's what first popped into my head. Feel free to disagree with me if you know better. :)
This could go in the Identifying Animals Through Osteology mission at http://www.projectnoah.org/missions/8475...