Black-Oil Sunflower Seed
The most common type of seed for attracting the greatest variety of birds to your feeders. Rich in oil, black oil sunflower seed give birds the energy they need to live. This seed has thin shells, making it a favorite feeder food of cardinals, chickadees, finches, and sparrows. If you are going to offer only one type, give black oil sunflower seed a try.
Hulled Sunflower Seed
Hulled Sunflower seed is a great economical alternative to whole sunflower hearts--with all the benefits. This seed is full of high-energy protein and oils. There are no hulls to clean up because the birds eat  it from seedfeeder very bit. You'll attract finches, cardinals, chickadees and sparrows.
Safflower is a favorite seed of the Northern Cardinal. House Finches and Mourning Doves will also feed on this type. Gradually reduce the sunflower until only safflower seed is left. The nice thing is that squirrels don't like the bitter taste of safflower. 
Thistle, or more accurately, Nyjer seed, is a finch favorite. This high-oil seed also loved by Goldfinches, Purple Finches and even Mourning Doves. It is interesting to know that nyjer imported from India and Africa, but is available at most places that offer wild bird seed. It is best to feed nyjer seed by itself (rather than in a mix). 
Striped Sunflower Seed
Striped Sunflower Seed is a high energy food source for wild birds. This food is appealing to birds that enjoy cracking hard shells and a tasty flavor of the seed. It is the perfect treat for for attracting wild birds such grosbeaks, jays, cardinals, chickadees, nuthatches, finches, and titmice.
Shelled Peanuts
Peanuts are the seed of the Arachis hypogaea plant and actually grow underground. They are not true nuts but are actually legumes--and many birds love them! You'll double the bird activity at your feeders when you serve shelled peanuts. Neither roasted nor salted, they arrive ready to serve, naturally full of fat and protein. Birds such as titmice, woodpeckers, chickadees, juncos, nuthatches and jays just love them.