ailment

I found a website with an extensive list of medicines with appropriate doses for pigeon diseases. http://www.pigeoncote.com/vet/formulary/formulary.html

Does anyone have experience of pigeons who pluck their own feathers out? I've been reading in posts about vets who put to sleep pigeons for ailments that could have been treated and it got me thinking about a modena fancy pigeon i used to have. Out of the blue one day it stripped its feathers...