Clingers Only (Green) Easy to fill and clean. Protects the birds we love from disease. Entire lid comes off to fill from top & easily locks back into place. Very small port on others which swivel open to fill (in snow and ice these freeze solid). Large Capacity – Holds 2-3 times more than other small bird feeders which often run out quickly – 3.5 to 4 cups of seed. A special feeder for Chickadees, Titmouse, Nuthatches, Goldfinch – Encourages larger birds like Starlings, Grackles, Pigeons, etc to feed elsewhere. Heavy UV resistant thick plastic construction. Lifetime guarantee. Feeder comes boxed and fully assembled – others can be frustrating to assemble and take apart for cleaning.