See most chickens are actually smart, and people don't realize just how much instinct they have to avoid predation. When my chickens go to roost, they aren't satisfied with any old branch. They go out on smaller branches so if a predator were to try to climb out to get them, the limb would give way. Only my heavier hens roost in the hen house. The lighter, more agile birds like the games, Leghorns, Legbars, and game mixes all choose on their own free will to roost way up in the trees.
I don't lose many birds to predators, a few here and there when they venture too far off our property which is a risk that comes with free-ranging. But we don't lose enough to make a dent in our numbers. That is where the phrase "go out on a limb" comes from I guess. lol I have actually lost more birds to my own turkeys this year than to predators.
Also, my chickens roost in trees near the fenced in lot of property where my dogs, goat, and turkeys are. That must be where they feel safe. The proximity of the dogs is enough to keep predators away from there. The only areas we deal with predators are at the far end of our property away from the dogs usually. Every now and then we lose a rooster on a tie cord, but not too often.