Cardinals are particularly fond of sunflower seeds, especially the black oil sunflower seeds, which are high in fat and provide essential energy for these birds. Fortified with vitamin A and D3 to aid growth, reproduction, feathering, and bone development. Calcium added for improved digestion, bone strength, and eggshell development. A specialized, high-energy wild bird food designed to attract cardinals, grosbeaks, and finches. It features a nutrient-rich mix, primarily black oil sunflower seeds and safflower seeds, providing essential fat for energy,, plus vitamins for growth and bone development.