Severe feather plucking is when a bird is mostly bald. At this stage, feather plucking has turned into a compulsive habit. A thick, stiff bird collar often helps to interrupt the feather plucking habit. But, you'll also want to consider a comprehensive level of support by offering dietary supplements, like Parrot Calming Formula and FeatheredUp! Learning science-based behavioral techniques to retrain your bird is very important. Find out more here.