I am building a structure to house my bantam chickens, ancona ducks,and sheep. I plan on having a greenhouse structure on one side where the chicken, duck and greenhouse will be and then the other side will be a sheep shed. How much space should I allow for about 10 ancona ducks? I plan on having a house, pen and then a yard. They will be closed in the house/pen at night time and will have access to the yard during the day. My chickens will be in a separate space. I've seen about 3-5 square foot per ducks but that would only be 30-50 square feet for the bunch-does that sound about right? Would a pen of 5x10 be about right if they go out in a yard during the day?