Birds love seeds, grains, and nuts such as black-oil sunflower seeds, white proso millet, peanuts, suet cakes (a mixture that includes beef fat), nyjer seed and cracked corn. While it's common to see bread crumbs thrown for birds, this is not a good food source for birds as it doesn’t provide adequate nutrients. The humane society advises avoiding chocolate (it is toxic for birds) as well as table scraps which can attract rats.