What is the ideal (if there is one!) size wood for a roost? And is flat or round better? I have 8 chickens, all different breeds, smallest is a Cochin, largest is a Rhode Island. Do they wrap their feet around it or sit on it? Hope that didn't sound daft! I live in Perth Western Australia, so we don't get snow, but it does get quite cold in Winter at night. It's time to revamp their house! So apologies in advance, you might be hearing from me a bit!