I have 4 ducks. They have a barn in which they sleep at night and where they spend a lot of time in the winter (their choice). They also have a covered “duckio” that is not attached to the barn. It is, I think, 18’ by 18’. That’s where they spend their days when there’s not snow on the ground. I used to free-range under “loose supervision”, but I lost a Rouen to a bobcat. Now, I no longer free-range, but do take them on foraging walks, which they love. There’s still a bit of danger on the walks. I had a near miss with a hawk a couple of months ago despite being less than 10 feet away from the ducks. However, the walks are an important part of their lives…when it’s not snowy and cold, of course!