ACK!!! 4 of my 6 buff orpingtons have a tail with some black blotches on the feathers, they are pure bred[got them from Murry Macmurry hatchery].one day i looked out and one of my orpingtons had black on it's tail feathers.what happened here? is it common? is it harmful? How will it affect showing them?is it fungus or just markings? it appears to be just markings, not sure though.has any one else had this problem before? or is it reverting or something like that? is it contagious?One did it first then others did it too. I've heard of crowing hens before and broody roos. do they think they are one of my back astrolorps? i have many many questions. i just want to show them and want to know if this would affect that. HELP!!!!!!!!!!!!