We have 3 2-3 month old pullets that we just got and we had them seperated from the rest of our flock. My huband got one of those big rubbermaid tubs for their "coop" at night. He screwed it down to a board for the floor, put a board over the door opening (screwed in a way so it would move open but still secured) and put a heavy log on top so nothing could move it. He drilled 2 inch and a half holes on top so they could get ventalation at night. This morning he went to let them out. Something had pulled 2 of them through the holes at the top. The door wasn't messed with. The whole tub was moved a little, even with the log on it. What in the world could have done this? We live in a city area, so it's not out in the country, I don't know if that makes a difference in what it could be. We have only had one other chicken killed. One of our hens was out at night and we didn't realize she was out when we locked up the coop. Also, will the last little chicken be ok by herself? Can chickens thrive alone? I can't put her with the rest of my flock yet, we think she is sick and she hasn't been on antibotics very long.