So all of my goslings survived their cold rainy night a couple of weeks ago. I noticed yesterday that one of them had some blood behind its wing. Today there are 4 of them that are covered in wounds. It looks like feathers are being pulled out. I have never seen them fight, and I spend a lot of time with them. The only thing I can think of is either they are preening too roughly or they are fighting after I lock them up for the night. Thoughts?