The Squirrel Buster Plus is a deluxe truly squirrel-proof bird feeder. It holds 3 quarts (about 5 pounds) of bird seed. It comes with a cardinal ring for easier perching. Openings in the bottom section of the feeder (shroud) align with seed ports, providing birds access to the seed. When a squirrel climbs onto the feeder, its weight automatically forces the shroud down, closing the seed ports. Squirrels and large birds are foiled but not harmed in any way.