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Thanks for the comments, everyone.
Not sure if any of you know about the Felts Audubon Preserve in central Florida. They have a bird blind there with feeders that attract the buntings and also various other birds including cardinals. The blind is an odd design with huge picture windows. Not sure what the thinking was here, but the birds are able to see the photographers in the blind, and there are tons of reflections because it is light in the blind. You are shooting through that glass to get the shots of the birds. Anyway, the birds don't seem to mind the people, and the reflections don't appear to be noticeable.
I was using my 100-400mm II + 1.4x for these shots.