Last year, a male goldfinch at one of the feeders caught my attention with his unusual behavior, and I realized that he was blinded in at least one eye. I’ve seen him a couple of times since then, and each sighting rings in the halls of my heart because it reminds me that, for some reason, he stays near our farm, and that he seems to recognize me. I fill the bird feeders in the evening. We have various types of feeders — the cheap cylindrical kind that are easy to fill but also easy for squirrels to raid, the metal mesh kind that are impervious to rodents but do…