What sort of food stuff does the bird try to eat; will it have preferred treats? Has the chook been to a veterinarian? For anyone who is purchasing a youthful fowl, ensure that it's entirely feathered and completely weaned (won't need to be syringe fed or mother or father fed). https://birdparadiseaviary.com/product-category/birds-for-sale/cockatiels-for-sale/