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Your cockatiel can go from beautiful to bare if he gets into the habit of plucking his feathers. Plucking goes beyond preening or molting. If your cockatiel is creating bare spots, take him to an avian veterinarian. Your vet will check for diseases that cause feather-plucking. If it's not a physical problem, you'll still need to observe your cockatiel closely. At the same time, don't give him any attention when he's plucking. Only pay attention to him when he's being a good bird. In addition, your vet can give you advice on any dietary or environmental changes your cockatiel may need.