I started out with 9 chicks and now after a few months have only 6 chickens left. Last week, my baby Rocky went missing, so I have 5 bantams and 1 standard buff. They are usually really good about going into their coop at dusk. It has never been a problem until about 5 nights ago. I allow the chickens to free range in a large fenced in area and have a small area gated off outside of their coop. The chickens are now roosting on the gate to their run and that is where they want to spend the night. I thought maybe the coop had a pest problem but I see no signs of mites. Plus, I keep it really clean. The coop is the back portion of my shed and there may be mice in the shed but it never seemed to be a problem. I have tight fitted closed doors to the coop and there are no holes for predators to gain access, so I don't think they were traumatized by an invader. I do have 3 roosters to my 3 hens. I have more chicks coming this week to even out the flock but could this be the issue? Maybe a turf war of sorts? I am currently forcing (that is a strong word, I am gently coaxing) them into their coop in hopes to retrain them but it is still concerning to me. Thoughts?