my 5 week old chicks are in their new digs and after playing outside all day they wont come out from under the coop and go into the mcmansion that I built for them. I kept them inside for 3 days as was suggested and the coop is 18" off the ground and I cant get under to get them. temp will be in the 70's tonight and they wont freeze as they huddle together. They have feathered out nicely and I left the coop door open and the heat lamp on if they choose to go in tonight. Any suggestions? I can close off the coop crawlspace tommorow after they come out for a while to get them used to going in at night, or I can put them under house arrest for a few more days , but they love playing outside and are a joy to watch so I am hesitant to do that. Any help would be greatly appreciated.