Squirrels don't usually eat suet, but they could. The squirrels on my property never bother my suet feeders, but they sometimes empty out my bird feeders. I have a ground feeder for squirrels and rabbits (and anything else that eats on the ground) but we often have as many as 8 squirrels at the feeders at the same time, and they don't feel like waiting their turn at my ground feeder.