Three of my chickens had no feathers on their butts (one speckled sussex, one buff orpington, and one delaware- all of them just passed one years old) I thought that it was just because the chicken (delaware- also one year old, did not have a bald butt) that was on top of the pecking order was pecking off their feathers so I didn't think it wasn't that big of a deal. All she needed was a little isolation and it would be good to go. However, today, one of the Delaware chickens with a bald butt just dropped and died (I didn't see her die, but I fed her in the morning and an hour later, she was dead, without any symptoms). I am worried that it had something to do with her bald butt. She didn't have any peck marks on her, so it can't be from the chicken on top of the pecking order, and she was her usual self, happy and excited at anything, the day before. I have no clue what she died from. It might be from not enough exercise that maybe led to a heart attack? I talked to a couple people and they said that doesn't happen often though, and considering our chickens were fairly in shape. Also, I felt one of the bald butts when I was holding one of the chickens, and it seemed to be abnormally harder than usual. Has anyone ever had something like this? I am bringing the remaining two to the doctor tomorrow and I would like to know what to expect. Here are two pictures of the bald butts- one from the Delaware that died this morning and one from the buff orpington. You can't see it, but the buff orpington had kind of a scab on its butt and it was purpe-ish blue, which is really scaring me. please help!