So after some convincing and giving and taking and negotiating with the wife I'm going to be getting some chickens. I had them when I was a kid but I haven't had any since than. At what age can they be placed out in the coop without a heat lamp? (part of the negotiating was no chicks) I'm looking at getting either Buff Orpingtons or Autralorps or maybe a little of both although will be only starting out with 3-4 birds (for now, again part of the negotiations). Thanks for any help.