This guy hung around the feeders and birdbath for much of the fall of 2015. To answer the burning question, I’m not sure what happened to the feathers on his head. Mites? Molt? Either way, the feathers likely grew back by the winter and the bird was fine.
Well, like pictures of cardinals. Like cardinals, for that matter. Always a pleasure to see them in my very urban neighborhood. But this poor fellow!