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Bird food or bird seed is food (often varieties of seeds, nuts, or dried fruits) eaten by birds. While most bird food is fed to commercial fowl, people also use bird food to feed their pet birds or wild birds.
The various types of bird food reflect the species of bird that can be fed, whether they are carnivores or nectar eating birds.
Sunflower seeds attract the widest variety of birds, and so often form the mainstay back yard bird feeders. However, other varieties of seed can help attract different types of birds to gardens and back yards. In general, mixtures that contain red millet, oats, and other “fillers” are not attractive to most birds and can lead to a lot of waste as the birds sort through the mix. 
While it is a popular practice to feed wild birds from bird feeders, they can carry potential risks for the birds that feed there, such as disease, malnutrition, and predation by domestic animals. Researchers recommend that bird feeders be disinfected every time they are refilled.
Black sunflower seeds are highly recommended for use in bird feeders because they attract a wide variety of birds, have a high ratio of meat to shell, and are high in fat content (especially important for winter birds). Other common bird seeds include Niger, or thistle seed, a favorite of goldfinches and redpolls, millet for sparrows and juncos, and safflower for cardinals, among others.
Suet is recommended for insect-eating birds like nuthatches and woodpeckers. Artificial nectar – essentially sugar water – attracts hummingbirds. Bread and kitchen scraps are often fed to ducks and gulls (although this can lead to nutrient deficiencies and increased defecation for the birds in question). Chickens are commonly fed maize, wheat, barley, sorghum and milling by-products, in a mixture traditionally called chicken scratch. Pet parrots are fed fresh fruit, vegetables and nuts (in addition to seed).
When feeding wild birds the Royal Society for the Protection of Birds (RSPB) suggests that it be done year round, with different mixes of nutrients being offered each season. Selections should have additional fat content in the winter months, and additional proteins in the form of nuts, seeds and dried worms in summer when birds are changing their plumage and may be molting.
Farmed birds fed commercial bird food typically are given very specific scientifically designed pre-blended feed. Examples of commercial bird food for chickens include chick starter medicated crumbles, chick grower crumbles, egg layer mash, egg layer pellet, egg layer crumbles, egg producer pellet, and broiler maker med crumbles.[clarification needed] Pellet crumbles are often prepared for tiny chicks. Mash is more finely ground.
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