Hi, In the Spring of this year, we ordered 25 pullets from our local Tractor Supply. They shipped us 26 and all survived. I gave 10 of them to a friend of mine. We ordered a variety and received 5 white leghorns, 5 buff orpingtons, 5 Americaunas, 5 rhode island reds, and 6 silver-laced wyandottes. My friend took 2 of each variety. In the Fall, we started to notice that our white leghorns were feather picking the other birds at their tail heads. The white leghorns are untouched. I researched the topic...conditions too hot, insufficient diet, boredom, overcrowding, etc, etc, etc. Most people say that our chickens won the lottery the day they were picked to be shipped. We have gone to great efforts to create the finest environment for them and we strive to do everything right. Their coop is a 14' X 14' building with multiple windows, shelves, and nesting boxes. This was an old chicken coop that we refurbished. Most people say they would move into our chicken coop if they could. We built a 14' X 14' adjacent outdoor run that is fully predator proof. They eat a commercial balanced diet. Daily they get scratch and many, many treats. My mother-in-law goes in that coop multiple times a day to tend to them. They have toys, perches, swings, and ladders. We sometimes hang a head of lettuce in netting and let them chew on that. Hence, they are not overcrowded, or overheated, and they can't possibly be bored. I'm going to start pulling my own hair out soon. My 13 of the 16 birds are looking terrible thanks to the white legshorns. Interestingly enough...my friend said that her 2 white leghorns from our batch were doing the same thing. Alas...a genetic component? I had read that some breeds were more prone to this behavior. And white leghorns were one of the breeds listed. We have tried Hot Pick and Blue Cote (sp?)....but the areas of feather loss are getting bigger and bigger. We are discussing separating the white leghorns from the rest of the group, though we aren't sure if this is a good idea. I have read some on trimming the upper beak. Will that work? What is the best solution to this problem?