So far no problem with squirrels here yet. I sometimes see or hear one in the summer. I feed Niger, Black oil sunflower, a wild finch mix, a cheaper feed with corn..........I never see birds at my suet cages. I put bread ends and crusts in the tray feeder and something is eating them, I think the Jays. I also have 2 large containers of fresh plant material on my porch that I made for the holidays which contain crab apples and I am pulling off the apples to put on the feed tray and something is eating them. I also keep water near the feeders which is a problem when it is so cold. I bought a metal dog dish and the frozen water drops right out so I can add fresh warm water. Some of the birds were bathing yesterday......