Taco has a LOT of pin feathers on his head and neck that he can't reach himself, and any time I'm giving him scritches and try to help pinch or twist the sheaths off he yells at me and pulls away like it hurts. Short of getting a second macaw who can preen him (lol), is there a way I can help loosen them without tugging on his feathers and upsetting him? I've been giving him a lot of showers (to his chagrin) but his poor head is just covered in pinnies and it must be so uncomfortable.