Pennington, Metal, Seed Cake and Suet Woodpecker Wild Bird Feeder, with 2 Cake Capacity is specially designed to feed clinging birds. Birds like Woodpeckers, Titmice, Chickadees and Nuthatches have feet that are designed to naturally cling to surfaces and are known to eat and forage upside down! As a bonus this feeder not only attracts clinging birds but it also deters nuisance birds like European Starlings. These nuisance birds can’t cling so feeding suet and cakes from upside down feeders deters these nuisance birds from feasting at your feeders! The Pennington Metal Upside Down Seed Cake Feeder is made of weather resistant durable metal and holds up to 2 large seed cakes or 2 large suet cakes. With its two cake capacity that means less trips to fill up the feeder for you. The gravity design allows the second cake to drop down to the feeding surface when the first cake is gone.