Jerry, is your survey revealing any correlation between diet and plucking? Cage size and plucking? Just curious.
It would be interesting to see a more extensive survey done on 'toos that pluck and don't pluck, including diet (pellets or no? type of pellet? how much fresh foods? percentage organic? eggs and/or meat fed, etc.), cage size, cage location (near a window?), tension in household among humans, what started the plucking, type of water supply (filtered, distilled, tap, etc.), amount of out of cage time, unfiltered sunlight/special lamps, amount of showers, time spent with/on owner each day, training, veterinary test results, etc.). It would be good to include non-plucking birds as well in the survey, to see what could be discovered.
It would also be interesting to hear reports about "cured" former pluckers, too, and what worked for folks that have been successful with this sad problem.
Would anybody else like to see a survey like this done? Would it be possible maybe after you're finished with the current survey?