I have 2 hens and a rooster. Sadie and Ethel and Butch. I've seen raccoon chews through the top of heavy duty plastic garbage can lids and have even had them try to come though a window screen in my kitchen, lights on, wife screaming get your gun get your gun so I don't think that my 11oz per yard tarp would keep them out if they decide to go in. It is a real heavy tarp but short of like a lumber tarp or steel tarp. Its probably the heaviest light duty tarp. It drops all the way to the ground in front and I have panels for the side. I gotta get a roof on. I'm trying to think of what other preds I have around here that could harm. Possum, fox, coyote, cats, bobcat, skunks,coons, coydogs, not to mention hawks and owls. I'm laying stone all around so digging will require more determination. What critters can get through chain link? Snakes and ???? My little helper peeking in from the tarp where it wraps around from the back loves to watch them and shes been good not trying to torment them. I haven't ranged them yet and she'll learn quick not to try and chase them although she'll take a shot at it we'll get it all worked out. We have 2 yard cats that are somewhat afraid of them right now. They're both pretty mellow but if a chicken were to come in grabbing range one of the 2 might go for it. I'll have to watch them close until I can see what the situation has in store for them. Ive got about 3 acres of grass and bugs and surrounded by woods. I's like to be able to let them range some. My thoughts were to keep it so I could move it easyily. I'll probably just build a fully enclosed coop and be done with it. The coop is something I found on-line." BESTCHOICEPRODUCTS" sells these kits. It was $150 and this guy get as much as $200. when people dont discover he runs numerous auction on ebay with varying pricing...same coop. They are really trash out of the box. BADLY constructed but well cut .I got out my bucket of wood glue some 1 by and my table saw and brad gun and went to town on it. poop canned the role out clean out pan its garbage also. Put in a new bottom. Once I reinforced and glued it up it goes together with 4 -1/4 20 3" nut and bolt and it dry draft free and solid. The chickens seem happy. They've been in a week now and both girls are laying. I made a "jungle jim" for them ( actually made it from an old Jack Daniels whiskey barrel and the ladder is from an old George Dickel whiskey barrel I put some straw in it but at the most they like to roost on the ladder. I figured they might like a place if they needed some quiet time.