Black-Oil Sunflower seed - This seed attracts birds with a thick slightly curved beak, like the House Sparrow, and many Sparrows as they can crack open the shell and extra the 'heart' of the seed .
Black-Oil Sunflower seeds,can be purchased with the hull (outer layer) of the seed) removed; what's left is the hearts and chips - excellent selection for most birds, as they are easily eaten..
Nyjer Seed also known as Thistle Seed is a small slender black seed which goldfinches love. You can purchase them pre-packaged in a 'sock' or purchase in bulk and put them in a birdfeeder.
Wild Finch Food is popular with all birds, as it is small enough for a large variety of birds to eat. I fill my finch food feeder three times a day to keep up with the demand.
Bird Seed to avoid - Milo- a dark red-brown larger seed, big junks of nuts they can choke on, corn and striped black sunflower seeds (they have thicker hulls are are harder to break open than regular black-oil-sunflower seeds).
Provide your backyard birds with a variety of bird feeders and seeds protected from the elements for a happy crowd. .