He doesn't seem to mind so much (I haven't checked for lice yet; perhaps lice reddened his skin to begin with, she started pecking, and he allows it sometimes because it brings relief) but his skin is red and irritated and she is pecking more often than ever. I am afraid that, while I am gone, only checking in to feed them once in the 4 days after tomorrow, that she will break skin and tear him apart after she sees blood, or the behavior will spread to the others. I only have tomorrow to fix this, or at least lessen it. And I cannot isolate either victim or perpetrator because there is a huge snowstorm going on right now where I live and only the one warm coop. I'm planning on giving them some additional toys tomorrow to curb the boredom (including filling their dust bath box). Does anyone know of anything nontoxic to chickens I could apply to his vent that would dissuade her? In addition, how do chickens denote a human's presence--how do I watch them without them knowing I'm there, so I can know how often it's really happening?
Thank you in advance to anyone with any potential solutions to this problem!