50x Fat Suet Balls Fat Balls are blended from beef fat, sunflower seeds, wheat, calcium and dried meal worms to provide a high calorie, nutritious source of food for many different species of wild bird. The ingredients used in these wild bird fat balls include wheat, a staple food for several different wild birds particularly the struggling House sparrow, sunflower seeds, a source of high energy natural oil, beef fat, a concentrated, high energy food source suitable for many.