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Also, hanging a fat ball in the little plastic mesh sack is a waste of time because it takes a squirrel a nanosecond to steal it. I use one of these. The squirrels are still able to hang off the bird table and eat the fat balls through the feeder but they can't run away with them any more.
But I do miss the comic relief of watching a squirrel trying to carry a tennis-ball-sized lump of food without dropping it.