I have a question regarding keeping my ducklings in a coop on my back porch. It is about to start getting cold (I know, it's not really that cold in Florida) and I want to be sure they will be safe. They are in a coop that has a closed area on the top and I have it lined with wood chip bedding. It is going to be dropping into the 40's over the next few nights, are they safe in that weather? They are about 3-4 weeks old.