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Quiscalus cf. mexicanus
I think yours is a female Quiscalus mexicanus. Very similar to Quiscalus nicaraguensis, which would have a much stronger white stripe above the eye.
Please, verify!
http://avibase.bsc-eoc.org/species.jsp?l...
http://en.wikipedia.org/wiki/File:Great-...
http://en.wikipedia.org/wiki/Great-taile...
Quiscalus nicaraguensis:
http://en.wikipedia.org/wiki/Nicaraguan_...
http://ibc.lynxeds.com/photo/nicaraguan-...
http://www.flickr.com/photos/squesada/60...