We have 7 call ducks (2 female, 5 male), 45 chickens that free range during the day and come in the barn at night. Three drakes (6 months) that hatched this summer were no-shows at bed check a week ago. We found them swimming in our small and shallow river, about 300-400 feet from the barn. The river is still mostly open but icing over (we are in northeast Wisconsin) I was delighted to find them alive and swimming and looking content and have been bring food to toss onto the ice. Today, one is missing, I'm guessing a predator. I want to get the others back to the barn but 1)their wings are not clipped and they could go back themselves if they wanted to go back(2) I do not want to risk falling into the river to try to catch them. We have a net but I'd have to get on the ice to get close. Does anyone have any ideas? I've thought of bringing a load of straw by the bank for them to keep warm. I can continue to feed them. But clearly they are likely to be killed by something. And as weather gets colder, what is the likelihood they would survive?