Our Yellow Nape will be 20 years old this month. For the last several weeks he has lost feathers right where is neck meets his shoulders in a spot about the size of a golf ball. We know he is not plucking. He has all the little down feathers but the regular feathers are coming in few and far between. We took him to our Avian vet and she said he is fine. She has been our Avian vet for at least 8 years so she know our birds. Just for some reason his new feathers are coming in with the quill being very thick and to keep helping him preen to break them easier. Anyone else ever have this happen?