As with all other animals, birds need a proper balance of carbohydrates, proteins, fat, vitamins, minerals, and water. Cockatoos are vulnerable to vitamin A deficiency, high cholesterol, atherosclerosis, stroke, insufficient dietary calcium, egg-binding, and other nutrition-related problems. Seeds are highly palatable and preferred by birds, but nutritionally they are incomplete, lacking vitamins, minerals, and protein. Fruits, vegetables, and greens should account for no more than 20-25% of the daily diet. Pellets are the ideal diet for birds and should ideally represent approximately 75-80% of the bird’s diet. Converting seed-eating birds onto a formulated diet is not always easy, taking days, weeks, or months. Consult your veterinarian if you encounter any problems with this transition or with the health of your bird. In general, birds on a pelleted diet do not need supplements. Cockatoos do not need gravel or grit because they remove the outer hull of the seed before ingesting the kernel.