How big is your flock, Johanna? My chickens will also peck another who has a wound started. But I don't get that kind of injury very often because I keep the roo population down. Roos tend to be more aggressive with the hens when there is a lot of competition. I also choose which ones are the most gentle when I do it, as the ones I want to keep. I've decreased my flock down to twenty five hens, and I'm facing extra roos now. I suspect one is plenty, but shall prolly keep two who get along. I have two more who need to be out of there and will be as soon as spring starts to come and others with egging flocks consider adding a roo.