My boys are Pekin ducks and are free range on the 2 acre lake behind our house. They come home every evening around 6:30 for their dinner. They get fresh corn and a grain poultry feed. At night they sleep in some tall grass on the back side of the lake where it is more wooded. I'm worried about them this winter. We have winter temps here as low as the 20's and teens with wind chills sometimes below zero. Snow fall usually once or twice a winter, but typically no more than 1-2 inches. The lake has never completely froze over, but it did have some ice on it this past winter. The boys have had the run of the lake all spring and summer and have not been housed in the 7 mths I've had them. Do I need to build them some kind of shelter this winter or will they be ok to continue to roam free on the lake?