Thousands of delighted bird-lovers (and well-fed birds) confirm this patented bird feeder is “best of class” when it comes to foiling squirrels. Designed for both perching birds and those that cling like finches, nuthatches, and chickadees, this feeder’s unique design works every time. Here’s how. Openings in the feeder’s wire shroud align with seed ports that provide birds with access to seed. When a squirrel climbs aboard the feeder, his weight forces down the shroud, closing all the ports. Dinner is over! Harmless, yet highly effective with both red and gray squirrels. (20” tall x 6” wide, 1.4 quart capacity)