I'm getting 15 ducks & 2 geese next summer, and I'm wondering how big of a house I need to build for them. I'm getting 10 Runners & 5 Welsh Harlequins, as well as 2 African Geese. For waterers, I'm planning on using the Nelson automatic waterers. They've worked quite well for the alpacas & didn't freeze last winter. They make a model that sits on the ground and is 11" tall. How many will I need? I'm planning on having them free range in one pasture during the day, and in the house at night. Though there may be some times during the winter when they could be confined to the house for a few days, due to storms or severe cold.