We're getting chickens and a rabbit in a few weeks. I want to build one coop that will hold both (separate areas, but shared air). Do I need to be concerned about diseases that could be passed back or forth? If the rabbit escaped and got in with the chickens, would they hurt each other? When I build the coop, are there tips for making sure everybody survives the winter (we live in the north, freezing temps and deep snow for weeks on end)? Thanks!