At my parents house, we have a pair of pileated woodpeckers who love my parents feeders. I think they are really interesting to watch and marvel at
My father also loves squirrels so he feeds them all year long. He is the only person I know who really enjoys feeding the squirrels. He grew up during the depression and his brother hunted squirrels and sold them (don't know to who?). He fed the family this way- so when my father sees a squirrel he feels indebted to them. He said that they would not have eaten if it weren't for the squirrels.