I got ya. I have a cornish cross, known for being lethargic, that would come flying by at least at shoulder high every day to beat me out to the feed can. I've seen chickens roosting 20 ft up in trees, literally 10' pole, 8 foot reach, and having to drive the pick up underneath to stand in the...
Yep, 20" won't keep much in. I clipped the wing feathers pretty short and some of my birds can still get over 48". You can do PVC pipe hoops and poultry netting and make a little covered run really cheap. A couple pieces of 5/4 and you can make it movable. If you go that route use electrical...