I am wondering if anyone has any experience / advice on a feather picking issue. I have 6 chickens, 4 of them are 6 months old and the other 2 are 4 years old. 2 of the young chickens are Salmon Faverolles (SF), one of them has (had) the typical beard while the other one never had those extra feathers. The SF without the beard feathers has starting to pick all of the other SF's beard feather (note that she does not otherwise appear to pick any other feathers). How should I deal with this issue? Thanks!