Yes, no openings larger that 1/2" anywhere, at least overnight. And build BIG, because crowding is never good. never mind "four sq. ft. minimum', go bigger! And ventilation, so important!
Pictures and dimensions of your coop and run, post here if you want advice.
mary
Good for you for spending time researching 'how to' before getting your birds!
Starting with healthy birds, and predator proofing, can't be overdone. Many of us have learned the hard way that our coops weren't safe enough, and that free ranging has huge risks. Having a really safe coop, and a...