It's kind of a case of be careful what you ask for. We built an owl nesting box and put it in the peak of our pole barn because we knew barn owls were in the neighborhood. They moved in the next year and set up housekeeping, if you want to call it that. They catch lots of mice and when they are feeding a brood, leave mouse pieces, parts and bodies on the ground under the nest until it becomes a stinking, nasty mess. Then when the brood leaves the nest, they scatter around the barn while waiting to fledge and drop copious amounts of white poop over all your equipment. Then they moved into the eaves of another shed and pooped all over the mowers, hand tools, etc. We finally decided they were not worth the horrible mess and took the box down and secured the other shed so they couldn't get in. You may have an entirely different perspective once you get them but they are MESSY!