A new seed has been developed that actually repels squirrels. The most important element is the type of food offered. Choosing the proper mix of seeds can help attract the birds you want, and discourage those you don't. Different birds prefer different types of seeds, but the widest variety of food sources will ensure the widest variety of birds.
Oranges are a favorite with orioles.
Serve any kind of seed in a platform feeder. Use a little everyday, adding more as the seed is eaten. This will attract towhees, juncos, bobwhites, grosbeaks, sparrows, finches, pine siskins, redpolls, woodpeckers, doves, starlings, and red-winged blackbirds. Serve niger seed, black oil sunflower seed, sunflower hearts or chips in a tubular feeder to attract chickadees, goldfinches, purple and house finches, nuthatches, titmice, pine siskins. Serve mixed seed , cracked corn , sunflower and safflower in a hopper feeder to attract cardinals, jays, grosbeaks, various sparrows, purple and house finches, nuthatches.