I have a pen from last year that I didn't downsize yet as the roos weren't fighting. they recently started fighting, pen had 4 roos and 11 hens. I am waiting for someone to pick up the roos for processing so I only needed to wait a few days. The hens started hiding in the coop to stay out of the way and the fighting wasn't constant so I thought I had time. The first hen had a bloody nose and looked beat up, was near the pop door so I thought maybe she just caught with the others running in and out of the coop. I heard a racket the other day and realized the roos started fighting indoors too. I went to check for eggs yesterday and found another hen, she had just laid an egg(wasn't there an hr earlier), she was dead. No obvious trauma. Checked her over...no parasites, no nasal discharge, all other hens look fine other than they are starting to look a little beat up. Roos are leaving tonight, will pull them early. I have 6 pens, no other casualties, no birds brought in. Has anyone ever lost hens due to the roos fighting?