Screw-On Bird Guardian Birdhouse Protector

The Bird Guardian keeps birdhouses safe from harm and protects eggs.in the nest from racoons, crows, squirrels and opossums and cats. it attaches easily to any 1 to 1.5 inch opening with the included screws. Tested by naturalists, the Bird Guardian has been found to be effective in preventing predators from preying on nesting birds.