I do extreme free ranging in a predator-thick environment. My 40 acres is in the middle of a few thousand acres of wider swamp and pine flatwoods. I have bobcat, coyote, black bear, red and grey fox, stray domestic dogs, coons, possums, skunk, 7 species of birds of prey, lots of large rat snakes, and probably more I can’t think of at the moment. I expect most of my birds to tree roost. Many of my hens brood their nests on the ground.
I lose very few chickens to predators. Its 60% the genetics of the chickens, which have varying percentages of gamefowl and junglefowl in them, and the remaining 40% is the presence of free range dogs combined with the chickens choosing to stay close to where the dogs patrol.
My other poultry (turkeys and guineas), on the other hand, get devastated. Mostly because they roam and nest far from the homestead where the dogs spend most of their time.
I am in the process of starting a new game flock in a remote part of the farm far from where the dogs regularly roam. This is the core habitat for a large bobcat that I’ve fought with for several years. He’s one of the biggest I’ve seen, roughly the size of my female hound. Here’s the main area for my new flock, and here is the bobcat’s pond about 50 yards behind the new flock area:
I will kill this bobcat if I can. Most of the mammal predators can’t catch the games, but I consider this individual bobcat to be an elite predator, having patterned me pretty darn well and avoiding my attempts to hunt or live trap him. I am in the process of getting a permit to use leghold traps (illegal in Florida otherwise) to catch him on this log he regularly uses to cross water.
Free ranging in predator-dense environments can be done. But you got to start with chickens that have a lot of their wild survival instincts intact.