Our bantam chickens sleep squished up in the eaves of their pen and have done so since we evicted them from the brooder. Those two are the only chickens in the coop, and I'm worried about the dropping temps (dips below 40F at night, will be in low 30s later). If they would actually go in their coop proper that has a nice box with fluffy shavings and a big roost and protection against the wind, I'd be much happier. Should I trust them to know when it's too cold? Or put mesh over the eaves so they can't get up there? The whole area is encased in hardware cloth and covered, so I'm not (too) worried about predators or rain.