I left our dozen 6-week-old chicks outside for 5 minutes while I was Googling, "can you leave 6-w-o chicks alone outside?" !!! Came back to 11. No sign of where it might be. Not a feather. Nothing. What might have a happened? A hawk? We live in a residential area with houses all around us and have a completely fenced-in backyard with a tall fence. Our dogs were inside our house the whole time. Sad. Lesson learned, I guess. I just though they would be happier if they had some time outside.