The squirrel proof cage fatball feeder from tom chambers stops squirrels from getting to the food put out for the song birds the bars of the cage are spaced so that squirrels cant get through but song birds can the cage is heavy duty and clips off easily for filling and cleaning and surrounds a 2 port feederr r squirrel proof fatball feederr made in the ukr 2 port seed feederr cage clips on and off