Great Horned Owl Duet

This pair of Great Horned Owls were perched in a tree and calling to each other in our backyard last November. Their calls were not very loud, and they were less than 100 feet from the house when I made the recording, just as the last light of day was disappearing. A neighbor's dog was, unfortunately, much louder. You can still hear the owls on the video, though, and you can make out some of their head bobbing and movements, all of which must mean something to them. I hear the owls calling in the morning every now and then. I assume they're a mated pair and are probably going to nest somewhere nearby.