The foundation fencing around our yard was built in the 40s at least, and the fencing is going literally through the trees. Big huge oak trees. Looks like the fence is growing out of the trees, it’s odd. But I’m not cutting down healthy old oaks. It’s great shade for the chickens too. But apparently the cicadas around here like to hang out in the trees, and they’re so loud, louder than my rooster if you can believe that!
I use 2" heavy duty knotted netting over my pens here are a few picks on how I installed mine. These pens have been up and working for over 10 years now. If you get snow you will need to do some things for snow load like I did.
That looks great! That looks about like I want to do, except mine will be at least 8 ft. tall all around!
How about flash tape, ribbons, etc. tied to the netting? Even spinners, anything to make the netting more visible. Good luck.
Mine are free range and the wild birds share their scratch. I have never had a problem with illness from them. Rural OK so mostly cardinals and such. Maybe some areas have more problems.
Whew! I have cardinals, blue jays, crows and mockingbirds mostly. But the wild birds that really liked to share the feed, were the cardinals. I’ve still got one cardinal we named Houdini. He magically appears inside the yard for the buffet. He is determined!
I’m going to have to roll with it, I have no idea what else to do. I can (try my best) to keep predators out, but wild birds…they’re literally everywhere here. My rooster doesn’t even scream at the cardinals anymore lol.
So I’m not the only one!!! I’m such a worry wart myself and sometimes think I’m the only crazy chicken momma who freaks out when I see one of my girls napping in the sun!! Inevitably they get up and take off running when I come near like oh geez her she comes again everyone run and hide! lol 
String some colored string in your netting. Theywill steer clear of the netting.
