Vegetables are a wonderful source of vitamins, calcium and iron.
The darker vegetables have a higher nutritional value. Offer broccoli, carrots, spinach, bell peppers, sweet potatoes or corn. If your bird absolutely will not eat green pepper strips, try cutting them into small cubes, or maybe mixing with another vegetable. Fruits are also a great source of vitamins as well as providing a natural energy boost. Almost any fruit can be offered - but don't feed fruits that still have the pit.