I need help on my duck coop. We own a lake behind our house and there were ducks someone dropped of and left back there but we don't know who. They are human friendly so obviously they were owned before. They come right up to me and I pet them. So we saved them so they wouldn't starve and die in the winter. They stay at my neighbors house but I take care of them. They can fly but they couldn't when we saved them. The pen they are in has no roof and nothing on the ground. Do I NEED those? I have had them for 1 month and nothing's happened. My moms work friend has 11 ducks and she keeps them in a pen like that too. She said they are so loud they scare predators off. They have a house in the pen should I put them in that @ night?