DH finished the second tractor yesterday and we put the RIRs inside. They got through the night beautifully. We went to a movie this afternoon and came back to find them all over the yard. Yes, that's right - the hens figured out how to open the door. DH had decided that the first tractor was too elaborate so he went with a simpler design for the second. We rounded them up and shored up the door with a stack of firewood. Then I said, "You know. I'm thinking that if the chickens can open the door, the raccoons can probably figure it out too." That got a ha-ha. At this rate, I will be learning about chickens until the day I die.