I have 3 ducks. 2 male and I female. They have a large sheltered area that connects to a smaller enclosed area for freezing temperatures. The larger area has clear tarp coverage so the sun can still shine though. The smaller area is complete an a-frame area of wood. Lots of hay in both. Lots of food, which is there heat source, duck pellets, veggies and some bread (but as a treat, it's not real good for them). Morning and night they are given fresh water in a large heated bowl, enough to dip their nostrils into. They are let out everyday in a very large fenced-in area. Put back in at night for me to sleep without worrying. Protected from weather elements and critters who are looking for food. In northern Michigan we get frigid temps and coyotes who come uninvited.
Their neighbors, 6 chickens, are in an insulated coop with an attached run and there door is open to come or go throughout the day under my call if the weather isn't extremely windy and freezing. They still scratch and find natural grit.
Everyone must be happy, because Sophie the duck and my hens are all laying beautiful eggs!