Covered and protected just for bluebirds! Outer caging protects gentle bluebirds! Your bluebirds will feed undisturbed. Inside, a clear plastic dish sits and serves their favorite foodsâ€"mealworms, nuggets, or suet pellets. Clear 12 inch covered dome protects from weather, green metal caging. Measures 7-1/2 x 8 inches in diameter.