LOLOn a side note, think I'll stop using circular vents..figuring out the sq. footage of circles is making my brain feel like that soft shelled frozen egg above..cracked and oozing.
I never thought of that! I do have circular vents on the backside of my coop - I saved the wood plugs so I could close off some if needed.
Front of coop the rafters (?) are open - I've not had any problems so far, but keep a close watch on my birds nonetheless.