This premium-select, high-oil seed is preferred by Cardinals. Normally, Squirrels, Jays, Starlings and Grackles will not eat safflower seed due to its bitter taste. Primary Species: Cardinals and other songbirds. Preferred Feeder Type: Hopper Feeder Tube Feeder (Large Holes) Platform Feeder On the Ground. This product is produced and stored in facilities that use milk, eggs, fish, Crustacean shellfish, tree nuts, wheat, peanuts, and soybeans and thus may contain one or more of these ingredients.