I am wondering how to figure out who's picking the feathers off the backs of my hens. I've had chickens for 2 years and never had a problem before now. When we had the rooster he did a bit of damage to a couple of them so we sent him packing. I know they've picked on my silver spangled hamburg but now it's spreading to the other hens. tonight I found one of my RIR's with a fresh 1x.5 in swath on her back missing and freshly pink. Out of the whole flock there's just one that has no feathers missing whatsoever. Is this this instigator? or is she just better at running then the others? They have plenty of room and get to free range for roughly 5 hrs a day. I feel sick about how they look... my hens always look amazing and I want to get them back to that. Once I find the instigator do I need to cull it or is there a way to rehabilitate it? Thanks