So I just introduced some fully feathered chicks to a group of older chicks, ranging from 15 weeks to 8 weeks. These ones I just introduced are five weeks old. I didn't just toss them in the coop, I kept them in a large dog crate inside the coop for a week so everyone could see everybody. Well today, I turned them loose. There was some expected posturing and small squabbles, but nothing earthshattering. However, tonight when I went to close up the coop (since everyone puts themselves to bed safely), I found the chicks all undernearth the coop. There was no way for me to get them. Even if I could poke them out with a stick, without a helper to grab them on the other side, they'd just run back under as I ran around to grab them. My run isn't very secure, since my coop is like a Fort Knox that gets shut up every night. It is build to human code, the windows have hardware cloth screens, etc. So even though I closed the door to the run, since the entire coop is surrounded by the run, I am worried. Something could easily tear through the netting attached to the hardware cloth fence, since it is only meant to be safety from aerial predators, not something with claws. And it just started to rain. The coop is on the highest ground in the property, so any water will drain away from the point it is standing. Even if they are feathered, I'd hate for them to get chilled. Do you think the little twits will learn that inside coop = warm, safe, secure? I mean, there are plenty of places to roost, that ought to be better than hunkering belly down in the dirt to sleep. The other chickens, introduced at the same age to the coop (15 week old group was first) got the idea in no time, since they were confined inside the crate inside the coop too, learned that was home, and always returned at nightfall.