I know how much these birds weigh on average, but how big are they at full adult size? I can't find a decent picture with any frame of reference (like a person holding one). I'm trying to figure out clearance beneath my coop so they can go under there for shade if they want to, but I don't want to raise it up anymore than necessary for stability purposes. So, basically, how tall do these birds get? I guess the rooster would be the largest, so how big to the roosters usually get? Thanks in advance!