When they get stressed to the point that they do that to themselves there is usually no way to stop it.
LOL! I've been calling her Miss Purdue because she looks like a chicken in the grocery story. I've also threatened to fricasse' the other bird when she gets really loud. So one day, you never know what you may find on my stove top.
As for the behavior, did ya'll know that the first OCD studies were done on birds and dogs? Two parts of the brain don't connect and that Prozac is a drug that is supposed to help stop the compulsion.
Anyhow, coming to live with me, plus the collar and the drugs...we hope she'll stop mutilating.