Looking for a squirrel proof bird feeder? Our nyjer selective feeder is a dining sanctuary for dainty goldfinches. Larger birds can scare away the smaller goldfinch. But this Nyjer Selective caging is designed to offer goldfinches a protected enclosure for dining--while larger birds are blocked out. Overhanging metal roof protects Nyjer seed from weather; eight stainless steel perches, metal cap, and Squirrel Lock prevent squirrel damage.