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The Barn Owl has been around for the last 26 million years and its importance to agriculture in California is just coming
to the forefront. It is one of the most skilled hunters of rodents in North America. It does not have to see its prey to
make a kill. Its face is a dish shape similar to our satellite dishes and the ears are asymmetrical so it can locate rodents
such as gophers or mice rustling around for food under 16" tall grass, then swoop down and make the kill. Cornell University
did a study putting a barn owl in a completely darkened room. When a rubber mouse was dragged by a thread, 99% of the time
that barn owl hit the mouse. A live mouse was substituted for the rubber mouse with the same results. To sum up, the Barn
Owl's silent flight coupled with the hearing ability to triangulate on the target like radar makes it a formidable rodent
killing machine.
In 1997-98 a study of Barn Owls diet here in California focused on what the Barn Owls were feeding their young during the
eight week period from hatching to fledging. The study showed that 42% of their diet was pocket gophers, 30% voles (large
field mice), 17% deer mice, 6% house mouse and 5% other prey.
One Barn Owl will eat on the average of 155 gophers per year or 53 pounds of gophers. If you had a mere 48 Barn Owls
in your area, they would consume 7,440 gophers or 1.3 tons of gophers per year.
At Merced High School, where my colleague Steve Simmons, developed his Raptor Works, program, they are in their fifth
year of manufacturing Barn Owl boxes from agricultural waste that was headed for a land fill. They have produced nearly 5,000
Barn Owl boxes to date along with Wood Duck, American Kestrel, Screech Owl and Bluebird boxes. All proceeds from their box
sales are used for student scholarships and Barn Owl research such as the above diet study and banding research. Steve recently
told me that he banded over 1,600 Barn Owls in 2004 (in past years Steve has banded 3,000 Barn Owls in one year!)
By putting up a Barn Owl box, you provide a place for the owls to roost when the leaves drop off the trees in the fall and
a safe place to nest and raise their family of owlets (5 to 7 per box) in the spring. They, in turn will provide you with
365 nights a year thumping of your rodents in your fields. They never call in sick or demand a raise, you don't have to pay
workmans compensation or have to worry about any liability if they get injured on the job. The only maintenance you have
to perform for the owls once the box is installed is to clean it out once a year. Do wear a dust mask when cleaning out the
boxes and be sure to wash your hands when finished. If you have any questions, please feel free to contact us as telephone
and or e-mail assistance is always free.
Rodent & Gopher Consumption by Barn Owls
Study completed by
Jody Gallaway, Wildlife Resources Management
Julie Goldzman, California Polytechnic State University
Terri Jensen, University of California, Davis
Steve Simmons, Raptor Works, Merced, CA.
2 Adult Barn Owls x 48 Nest Boxes = 96 Barn Owls
3 Owlets survive per box x 48 nest Boxes = 144 Owlets
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240 (Total Owls) x 365 Days (Consume 1 Rodent a day)
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87,600 (Total Rodents Killed) x 42% (Gophers in Diet)
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36,792 (Gophers Killed Per Year)
x 156 Grams (Average Weight Per Gopher)
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5,739,552 (grams) ÷ 453.6 (grams
per ounce) Equals: 12,653 (Pounds of Gophers Consumed) or 6.3 (Tons of Gophers Consumed) in One Year which means...
Wow!
Now that's Rodent Control!
Acknowledgments
Wild Wing Company, would like to personally thank the following contributors to the development of this web page about Barn
Owls.
First, I'd like to thank my friend and fellow Barn Owl conservationist, Steve Simmons, for the Barn Owl Diet study and
his innumerable contributions. Also, I'd like to thank Bert Kersey and his wife Sharon, for the great pictures that they
provided to help illustrate Barn Owls in action.
Bert Kersey and Sharon are the owners of Backyard Barn Owls, located in Fallbrook, CA, and they put together a fantastic
video about Barn Owls. Shot from the back of their home, this video depicts 2 years of video shoots of a family of Barn Owls
in various stages of nest box activity. From eggs, to the hatching of the Barn Owl owlets, to the swallowing WHOLE of local
rodents ("YIKES!"), and all the way to fledging.
To quote Bert; "We first encountered Barn Owls ten years ago when a local tree and bird expert recommended putting up
an owl box for gopher control in our yard.
It worked (!) and we've had (Barn) owls ever since."
Wild Wing Company highly recommends the aforementioned video for teachers, conservationist, gardeners, vineyard owners and
vineyard management companies. Wild Wing Company uses the video to help visually educate our clients about Barn Owls, and
you owe it to yourself, your students and your customers the visual benefits that this great video provides.
For your ordering conveyance, you can order the Backyard Barn Owls video simply by clicking any of the Barn Owl pictures
on this web page or you can go directly to Backyard Barn Owls by entering; www.barnowlvideo.com
Enjoy the Barn Owls!
Sincerely,
John Schuster
Wild Wing Company
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