Sunflower Bird Seed in a 20 lb bag contains 100% black oil sunflower seeds. Royal Black Oil Sunflower Premium Bird Seed is all Natural and No Fillers! Sunflower seeds are the most popular treat for most all backyard wild birds. Premier favorite of Cardinals, Woodpeckers, Goldfinches, Chickadees, Titmice, Nuthatches, Juncos, Jays, etc. Keep your feeders full of sunflower seeds and you will be rewarded with a backyard full of songbirds. Put in standard tube feeders, wire mesh or hopper type of feeders and enjoy! Great attractor of Cardinals!