There was a thunderstorm this afternoon and about the time the rain started coming down I was getting worried about my 3.5 week old reds. I put my swim suit on and ran out there and they did not want to get out from under the coop so it took me 10 minutes to get them inside. The thunder got real loud and close the rain real hard. Being next to the metal chickenwire fence was scary! In any event I got them in and the door closed so they could dry off under the lamp. Any idea on how old the chicks need to be to learn to go into the coop on their own at night or during the rain?