Peanuts are another favored food and can be mixed with sunflower seed or fed separately. With high levels of both fat and protein, peanuts are especially a favorite of woodpeckers, nuthatches, titmice, and Carolina wrens. And don’t forget the suet, definitely a cold-weather bird attractant that is eaten by most winter birds. It can be fed from a variety of feeders, ranging from a suet cage to a wooden suet feeder, which is designed so that birds feed on it while hanging upside down beneath it.