Every spring I have to deal with the sparrows who decide that my closed grill is apparently an excellent place for a nest. It's not like it goes unused in the winter, but when they fly back north in the spring, they move in through the holes where a rotisserie would go if I had one and the battle begins. They build a nest, I remove it, they rebuild it, I remove it again. I tried filling the holes with aluminum foil, but they pull that out. We're fighting the battle again already this year.