We have our coop inside a wire dog kennel, anchored with hardware cloth buried around the perimeter and up the sides about a foot everywhere except the door. Have added hardware cloth on top underneath the canopy cover for added security, and feel it is pretty secure, especially with the solar-powered pop door on the coop for nights. However, our camera caught this guy managing to get into the run thru the 2" opening in the bars. At least he was a young one, but just goes to show you can never be too sure your birds are safe from predators. Here's the video: