Keep out squirrels and larger “bully” birds like Grackles, Doves, and Blackbir...Keep out squirrels and larger “bully” birds like Grackles, Doves, and Blackbirds - simply adjust the central tension spring post to feed the birds of your choice! | Classic Brands LLC Squirrel Tube Bird Feeder Plastic in Green | 19 H x 8 W x 5 D in |...more