Stupid me. My son's science teacher wanted some eggs to incubate so the kids could watch. He removed part of the shell so the kids could watch the chicks develop. Really neat experience for the kids who all live in a city! Not so neat when the teacher expects me to take the chicks back (when I clearly stated I had enough birds.) Now I have 3 mostly fledged chicks under a heat lamp in my basement. They don't have feathers on their heads yet and I estimate they are about 3 - 4 weeks old. The existing birds were chicks this spring. I have none who are brooding as I remove eggs daily. What is the best way to introduce these guys to the existing flock? I know they need another week or so for feathers to come in but want to be prepared. Also, they will be going out to daily temps in the upper 50's and overnights in the upper 30's. Thanks!