Thanks Matt, you beat me posting this my 5 min :) I was interested in this as well. The Sibley page says the post was updated as of 2010 and has some interesting comments at the bottom as well. White Great Blues have been found in nests in PA before, I don't have the reference on hand, unfortunately. Very interesting especially with vagrants how uncertain their origins are. I wonder if there are examples of Great Whites banded in Florida that have been resighted as vagrants further north? Or are these just a very small percentage of the otherwise typical Great Blue population.
Frank Marenghi
Annapolis, MD
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