I'm totally surprised we haven't had more interest in our coop from predators. There have been a few times that the pop-door didn't get closed, but to our relief nothing had bothered them in the night. Maybe the deer in the neighborhood know something we don't, because there is a group of 2-5 that always sleep about 20 feet from our coop. <shrug>
But I've personally witnessed opossoms, raccoon, coyote, stray dogs, eagles, hawks, and even a black bear on our property.
Every few days lately I've seen an eagle circling above; The chickens cluck-cluck and go under the trampoline. On 3 sides of our yard the bird would have to come almost straight down to get them though.. Perhaps that enough to make it not worth it unless they were desperate ... Or perhaps I've just gotten lucky so far..