Perky-Pet 5109-2 Fortress The Bird Shelter Squirrel Resistant Bird Feeder - 3.5 lb Feature 4 feeding ports, a 3.5 lb. seed capacity and an easy-fill wide mouth top A unique, weight-activated seed protection system stops squirrels from eating the seed Clear plastic cover protects birds as they eat Heavy-duty metal cap and 'chew-proof' metal perch Clear plastic reservoir makes it easy to monitor seed levels