Black Oil Sunflower seed in a 25 lb bag contains 100% black oil sunflower seeds. Sunflower seeds are the most popular treat for most all backyard wild birds. Premier favorite of chickadees, titmice, cardinals, nuthatches, goldfinches, juncos, jays, woodpeckers, etc. Keep your feeders full of sunflowers and you will be rewarded with a backyard full of songbirds. Put in standard tube feeders or hopper type of feeders and enjoy!