Just to add a different twist to this, related to the visibility thing. I have multiple coops, and in one separate coop, I have two cream legbar hens and a rooster. One of the hens is visually impaired from ocular Mareks. She has adapted (and her rooster is very sweet and protective/supportive of her), but she goes to roost much earlier. And because of that, her sister follows her and goes to roost early as well. The rooster stays up a little bit to "keep watch", but then he goes in early as well. They are always all tucked up in there almost an hour earlier than the other chickens many evenings.
- Ant Farm