Before we fenced in our acreage, we had one lost to neighbor dogs. Since the fence went up we had one other loss, probably a fox or bobcat. It was between feeding the barnyard at 5 pm and dusk when we go back out to lock them in the coop. That chicken was a loner and always ventured far off from the flock. The coop is not near the perimeter fence and we found the feathers there, on the inside of the fence, a snatch & carry, so not an owl or hawk (they can't carry a large chicken). Those are my only predator losses in the 3 years here, and we are surrounded by national forest. Every predator you can imagine. They are locked up tight at night, but daytime is all free range. Ravens are protecting their own nesting area, even when they aren't nesting. Their young ones come around every year, but they don't mess with the chickens. Also I have a good rooster.