I went out to the coop this morning and I noticed that my three Welsummers were missing feathers right before their tail. I picked up each one and looked closely at the feathers and they are snapped clean off half way up the shaft. It looks like someone cut them with scissors. I have two Blue Andalusians that are the same age that aren't having this problem (thought maybe they were molting?). All my other birds aren't having this problem either. My Welies are 11 months old. I don't have a rooster and have never had a problem with an aggressive hen picking fights either. I don't see any mites or other critters. What the heck is going on?!