By Jim White, Associate Director, Land and Biodiversity
Installing nest boxes in your yard is a great way to increase your bird viewing enjoyment. My favorite such box that I recommend for anyone that has a yard near a woodland is an Eastern Screech-owl box. Eastern Screech-owls are one of our most common owls and are found near most woodlands and woodlots in our area. These boxes simulate tree cavities and Screech-owls use them for diurnal roosting and/or nesting.
Most of my observations of Screech-owls in boxes are of roosting birds. They often can be seen poking their head out of the box while perched in the entrance hole in late afternoon or just before sunset. Boxes can by placed just about anywhere but should be at least 100 feet from areas of high human activity. I recommend facing the box toward a good viewing spot like a window that you often look out. Also, I like to face the box west toward the setting sun, so they can peer out and warm up late in the day. This will make it more likely that you will see the owl that comes to roost in your box. In my experience, Eastern Screech-owls only uncommonly nest in boxes. Nesting begins in mid-March or early-April, so if you see an owl in the box in spring it may well be nesting there.
Screech-owls require relatively large boxes. These boxes measure 12-15 inches high with floor dimensions about 8 inches square. The entrance hole should be 3 inches in diameter. The box should be placed on a tall, 10-15 foot pole preferably made of steel, but wooden posts can be used. Predator guards are recommended because they keep mammals and snakes out of the boxes. The boxes can be home-made or, if you are like me and lack time and woodworking skills, purchased at a local bird stores or on the internet. Construction plans can be found here. Screech-owls will also use larger boxes intended for nesting Wood Ducks.
Good luck with your project. If you have any other questions you can email me at firstname.lastname@example.org. If you are interested in the owls in our area, look for my future blogs in which I will profile each of Delaware’s eight owl species. Also, join me on my annual field trip to try to find all eight species in one day. This year, the Owls and Other Winter Raptors trip is scheduled for Sunday, February 14, 8am to 7pm.