I noticed one of my hens today has some wing feathers missing and in one side there's a little blood on one of the feathers where it connects to her?? She acts fine as does everyone else. She seems to be one of the "top birds" pecking at others when I give snacks etc. So I don't think it's from others pecking? No one seems on edge as I would think they might if something attacked her? Wondering though-could it be from my roo during mating? I have one other that's missing wing feathers but it different and no blood. It's been cold and snowy so they haven't been outside a lot, which made me think of feather picking (there are a ton of feathers in my coop now) due to boredom? Thoughts?