The 3-quart Brome® Squirrel Buster Plus™ bird feeder features award-winning, patented Squirrel Buster technology. This feeder is truly squirrel-proof and eliminates seed loss to pilfering squirrels. Chew-proof openings in the bottom section of the feeder 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. Weight adjustable closing mechanism effectively shuts out red and gray squirrels as well as some heavier undesirable birds. Dismantles for easy cleaning. Built-to-last construction!