Birds starve on diets lacking sufficient minerals - all seed diets are deficient in calcium and other minerals. Birds starve on diets low in protein - millet seed is common example of a seed low in protein and deficient in amino acids. Diets high in fruit and greens cause the same problem. Birds starve on diets lacking sufficient vitamins - seeds are deficient in many vitamins. Birds starve on diets low in carbohydrates - lettuce, spinach, endive and other greens have little nutritional value.
Birds starve on old food.
Birds starve if fed cafeteria style - allowed to pick their own diet from a variety of food. Birds starve when people don't care. Budgerigars are small, colorful birds with gregarious, entertaining personalities. Budgies may live from 6 to 18 years. The most common disease conditions are often the result of malnutrition.