For a birthday of mine a couple years ago, my husband made me an owl house. I wrote about it here: http://thesuels.blogspot.com/2011/02/owl-take-it.html
Each year, our owl comes back, sets up shop then leaves during the winter. I understand that male owls have to have a home to show a potential female. If she approves, bingo. Owls are pretty smart, huh? :)
Recently a pesky squirrel decided to move in while Mr. Owl was away at his winter home. I warned the squirrel. I even hosed the guy with a water hose to make him move on. He didn't.
Mr. Owl is back. and he dominated.
We have enjoyed watching our owl. The owl house was easy to make, here are some instructions: http://www.owlcam.com/whatever/boxbuild.htm