Bluebird feeders are specially designed to feed the New York State bird-the Eastern Bluebird. Bluebirds prefer insects and berries and that is why they require a different type of feeder. Bluebird feeders need a place for the bird to perch, and many are designed to hold mealworms. Mealworms are available both live and freeze-dried. The small berries bluebirds eat are not commercially available, but bluebird nuggets are! These nuggets are a blend of suet, berries, and insects that bluebirds love. Bluebird feeders are designed to hold either insects or nuggets.