Woodlink Squirrel-Resistant Brushed Copper Seed Tube Feeder

I needed a feeder for my expensive shelled sunflower seed. The starlings, and grackles were preventing the song birds from eating. I have been using this feeder for about a month and it works like a charm. I chose this one over similar ones because of the size of the cage openings. I needed it to be 2 x 2 in order for my bluebirds to use it since they are always breeding in my yard and happily eat the shelled sunflower . Anything larger than a bluebird probably won't fit. The only large bird that has had success is a red bellied woodpecker, and that's only because his long beak and tongue are able to reach. The one and only downside is the tube could be a bit fatter,to hold more seed, but that one issue is still worth it.