The Protector Caged Bird Feeder is a great feeder for small birds. The oval cage prevents (most) squirrels and large birds from reaching in and getting to the seed. Only small songbirds can enter. Birds cling and feed from the interior mesh tube, which holds shelled peanuts, our Number 2 sunflower or black-oil sunflower seed. It attracts a wide variety of birds, is constructed of durable steel with a hammered pewter colored top and is easy to fill. This feeder is labeled “squirrel resistant”