Downy Woodpeckers are the most common woodpecker species to visit a backyard bird feeder. They love suet feeders. They also enjoy sunflower seeds, millet, and peanuts.
Eastern Bluebirds are common backyard visitors however they prefer insects and worms will not readily visit a seed feeder. They prefer mealworm feeders.
Carolina Wrens are common backyard visitors however they prefer insects so may not readily visit a seed feeder. They do occasionally eat at suet and meal worm feeders.