Our African Grey “Jerry” (you can read Jerry’s full story at the above link.) is an adoption. He came into our lives 9 years ago. When he came into our home he was a feather plucker. He still has his moments that he still plucks his feathers. After many vet checks for his overall health, his feather plucking is basically psychological.
Here is an article by Chris Davis from Bird Channel entitled “Bird Feather Destruction Checklist”