Hi, we have a flock of 15 hens and a silver spangled hamburg rooster. Yesterday my son noticed that his tail was bloody. When I checked on him, I was surprised to see that it seemed like his tail feathers were pulling out, I could see alot of the base of them, and there was quite a bit of dark blood around it and dripping down. The hens were picking at him quite a bit, definately exacerbating the problem. My problem is, I don't know the cause of the blood. I didn't know hens to go after a rooster like that. There is no sign of a predator entering the hen house or pen. Just wondering if anyone has any info on a situation like this? We are sort of new to the chicken game. Thanks....