I might be the only person in the whole world who lives on a big farm, and wont free range my birds. I've lost 2 roosters to predators, and that was in (well, we thought it was) a secure run! The couple across the road had a flock of about 40 birds... lost every one of them to predators in one summer. Welcome to B.F.E. Ohio! We have it all! Even bald eagles! So here, we have about 75 ft of tunnels that connect different areas for them to forage. Under the daughters trampoline, a 5x9 grazing pen.... or just tunnels that run where we want weeds knocked down. They work great! My flock love them... and the feel safe! I'm not going to say they dont sprint the 30ft to the trampoline... but they do it. And Im not constantly on edge about predators! Now, they are not available to run the tunnels if I'm not home... but they still have a nice grassy run they can come out in. It's the only way I can do it, and sleep at night.