They are inside at this age. They are perfectly wonderful and easy to clean after. One of the reasons they are inside is Cupcake, our male muscovy. He is huge and we don't know how he will react to, or treat, the babies. As it is, Storm has already shown a lack of enthusiasm for him, so we figured they needed to be slowly introduced. He usually sits on anyone new, and well, he's got to be 3 times their size in weight.
They are very sweet ducks and do very well walking back into the house after the big ducks are put in their pen for the evening. They also walk from their "house" to the tub for bath time each day.