In West Virginia and looking at that photo, I'd expectt here are foxes, coyotes, raccoons, skunks, possums, snakes, owls, bobcat, weasels, and free ranging dogs around there. Probably hawks are around too but they usually prefer more open areas.
As "Wrangler" said, a few will probably get taken, but the ones left will be wise in the way of the world. Their offspring will be a bit wiser in that aspect too, especially if a broody raises them.. But yeah, you will always have losses. You just don't know how many or when.
For some people that is acceptable. although I bet Wrangler takes steps to stop those problems when they show up. For some people the loss of one chicken is unacceptable. We are all different.