My precious Illiger is plucking. It started right after the flooding from Harvey in Texas. I have had him evaluated by a specialist avian medicine and we have tested for everything she can think of. I finally had a collar that I special ordered placed on him and his feathers begin to grow back. I was hopeful. After three weeks we took off the collar and within three days he was pulling every new feather out. It is very distressing and it’s making me very sad. Please help if you can - just know he has tested normal in all testing Including lead and heavy metals. He has received an injection of vitamins and injection to reduce hormones two treatments in case it mites - no change( all of these Treatments were weeks apart) The next suggested Treatment would be something for anxiety.