So I've been reading 4sf of coop space per bird is what you should plan for your coop.... however, this seems very large. Is this really standard for home coops or is this luxurious? It seems so common to have much less space, especially in mobile coops. I want my chickens to be happy and healthy but I don't want to build a huge structure. So what's the scoop? How many people really allow that much square footage? Can you count roost and nest box space towards the 4 sf or is that in addition? Also, does anyone know the sf requirements for ducks and geese? Thanks!!