I used the applicable questions from the Posting Guidelines, hope it helps! 1) What type of bird, age and weight. The pecker is a Delaware pullet, over 7 months, normal weight, though slightly smaller in build than the others. The victims are two Cuckoo Marans and a Buff Brahma (same sex and age as the Delaware, but heavier). 2) What is the behavior, exactly. Della has always been a pecker. She "explored" anything that came into the brooder with a peck, and continues to this day. The bad thing is that she pecks HARD (it breaks my skin) and has nearly clean-plucked the lower backs of three other girls. 3) Is there any bleeding, injury, broken bones or other sign of trauma. Today was the first day that I actually saw one of the Marans with a bloody back -before there were just missing feathers or a single peck-scab. Today it looked like the quill shafts of several feathers had been broken and were bleeding. 4) What happened, if anything that you know of, that may have caused the situation. I'm not sure! As I said, the Delaware has always been like this -but now it has really gotten out of hand. I don't think she (or the others) are eating the feathers, since there are usually plenty scattered on the coop floor, plus their feed has plenty of protein. I'd appreciate advice on what to do for the three picked-on girls (would Blukote or saddles help/hurt?), and what could be done about the pecker. All six of my standards live together in a coop and most days they get to free-range in the yard (which they love). I'm afraid it might be boredom that provokes some of the pecking when they are cooped up, but I'm not sure what I could add in there to keep them all "entertained." When they are cooped I usually bring them some kind of edible treat to pick through during the day, but is there something else I could be doing? I'd hate to re-home her (and who would take her with this disposition?) but I'm getting really tired of my girls' barebacks and my pecked shins! Also, I've never seen the others peck at each other, and the RIR and the Easter Egger are untouched. Here's a pic from about a month ago of all six; you can see that the Marans and the Brahma are showing their underfluff around their tails where the hard feathers have been plucked out. When you look at them now from the back or side you can see pink chicken flesh.