: "A thoughtful nesting box - The person who designed this nesting box obviously thought a great deal about its features. 3. Cut the two side pieces. Made from waste 4" PVC pipe. 00. 5″ (3. They may be moderately effective against squirrels. Since this article is finally being published (in September)- The Henderson's did see swallow babies fledge from the Gilbertson. As a result, its membership rose to 2300. Bluebirds will turn to berries in the winter, especially as insects die off or go dormant. Search for: About. A quick cellphone pic of five baby bluebirds in the Gilbertson nest box. Nesting bluebirds enter through a 2¼-inch, U-shaped hole directly beneath the flat roof. 90 $ 49 . 1. Bluebird Nestbox Version 2, June 19, 2011Page 1 of 1 Roof Front/Door Side Floor Back Pivot screw (each side) Apply caulk to top of sides and to top of back before attaching roof. Face the box away from prevailing winds. House Wren; Tags. Make sure it is mounted 5 to 10 feet off the ground. The front of the box should not be attached with glue or nails; it is held in place by the. Actually, there’s a lot more to these bluebird houses than meets the eye! Bolt and Bracket. Right: Four baby bluebirds (Day 10) in a Gilbertson Nest Box on the University of Florida campus. This system can be easily used on any of the three nest boxes BAN distributes – the Gilbertson PVC, the Troyer, and the Gilwood. With only 1. Metal globe hanger with glass dish feeder allow for a variety of treats; fruit, jelly, meal worms, peanuts, suet, or seed. PVC Pipe: Length 10in (25cm) | Diameter 4in (10cm) PVC Female adapter Wooden dowel for perch: Length 1. 99: PVC pipe, sparrow-resistant, top-opening, small: Amazon: Average Price $32. Lumber/Material: 1 x 10 (top/bottom), 2 x 2 (corner blocks), 2 x 4 (pole mounting. If PVC boxes are paired with a wooden box, sparrows tend to choose the wooden box. 3. out-buildings, etc. Consider using a PVC-style bluebird house, like the “Gilbertson” nest box. Bluebirds Across Nebraska believes the Gilbertson conduit/rebar mounting system is the best system available for mounting a lightweight bluebird box. Front View. . Note: Bluebirds become quite territorial during nesting season. Teacup Bird Feeders. Step 2. Aug 1, 2016 - Discover (and save!) your own Pins on Pinterest. Another pioneer in bluebird trails is Steve Gilbertson of Aitkin MN who developed the Gilwood wood nest box and the Gilbertson PVC nest box. Church Birdhouse Vinyl/PVC $279. But until now, it wasn’t clear how well these nest guards worked, said Bailey. We would like to show you a description here but the site won’t allow us. 10) Hanging Western Bluebird Nest Box. The Gilbertson Bluebird Nest Box has a round entrance and a different design of roof as compared to the Gilbertson Box with a slot entrance. Diesen Gilberston Nest Boxes really enticement Birdies real their secure, warm built allow for many muses to live in these great NABS Approved bluebird boxes. Narrow (3. Materials: CONDUIT: Use 1/2-inch EMT electrical conduit (available in 10-foot lengths). , +2 more Salt Lake Community College. Birdhouse Designs. When the conduit is polished with steel wool, coated with a quality paste wax and buffed smooth, the system is resistant to climbing predators; however, we recommend a baffle for added protection. S&S Controller Mechanism. : "Success! - Within two hours a pair was checking out the nest box. Tested the effects of nest box preference and temperate on breeding success of Eastern Bluebirds on the University of Florida campus as a means to influence nest box management in positive ways. 95 +S&H. 00: Decorative, rooftop-style nest box for chickadees and wrens, made of recycled milk. NABS Fact Sheets & Plans. Feb 6, 2018 - These Gilberston Nest Boxes really entice Bluebirds and their secure, warm construction allow for many broods to live in these great NABS Approved bluebird boxes. Shop. the base of the box (See image 4). 0. . as well as promoting active nest box management and habitat improvement. The idea is to place the pins or. However, there is a great “sparrow-resistant” nest box that a lot of folks have success with called the Gilbertson-style nest box. Bluebird nest boxes are most successful when placed on a post or pole, in an open area, about 4' to 5' high. Shop The Birdhouse Chick today!A Safe, Sparrow-resistant Nest Box Sparrow-resistant boxes are criticial to keep out the Bluebird’s deadly nemesis: The House Sparrow! We recommend Slot Boxes or the Gilbertson Nest Box along with dedicated monitoring. SH- Hummingbird Feeder, The Original One Piece Drip-less Feeder/Silver Hobnail. Houses with front or side doors or the Gilbertson Nest Box are recommended for easy monitoring and nest removal. Holding pattern centered on door and about ¼ inch down from bottom of entrance hole, mark on cross hairs with an awl or sharp nail where the two screws are to go. The Gilwood andBluebirds prefer to nest in open areas with low or sparse ground cover. And, it thwarts starlings and house sparrows. The week Ben Gilbertson (BBA22/BFA22) graduated high school, he had to fit in a quick trip to Carnegie Hall. Dubbed “the Gilbertson Nest Box” it might just resemble a coffee can at first glimpse. 00. Boxes that Tree Swallows nest in should have "kerfs" or grooves (saw marks about 3/4" apart) or 1. Bluebirdsprefer a nest box that isnot as deep as the Hill Lake. The Gilbertson boxes reduced that number to just 3, proving a great deterrent for House Sparrows. I relocated the feeder array to another part of the yard some distance from the Gilbertson nest box. See full list on bbrp. Trap works on both wood and pvc boxes. Press two pushpins securely into the front of the nest box roof (about 1 3/4″ apart). English Sparrows prefer a lot of headroom to build their messy high dome-shaped nests and tend to avoid Gilbertson nest boxes because they have almost no headroom. : "Fast delivery, easy setup, birds nesting already - Trying to deter house sparrows, wanting bluebirds. Material needed: 1/2″ interior diameter steel pipe cut to 8-1/2′ lengths. by Fred Stille and Steve Gilbertson. Sep 25, 2016 - Free nest box plans for Bluebirds and other small cavity-nesters. that promotes the recovery of bluebirds and other native cavity-nesting bird species in North America. . Standing the test of time, bluebirds will return to these fine digs year after year should fledges be successful. Hanging Box: if you have a spare, replace the dirty box with a clean one. Here is the Solution4Patio Description:. Jan 11, 2020 - Discover (and save!) your own Pins on Pinterest. The PVC nest box is nothing new for Bluebirders. Birdhouse Projects. Bluebirds prefer large expanses of short grass with a clear flight path, ideally facing a field. If I had House Sparrow problems, I would go with a Gilbertson PVC. 1/8" wire Entry. . Gilbertson Nest Box - NABS Approved. Pay in 4 interest-free installments of $18. Macrame Jewelry. 3. None chose the Gilbertson box. In particular, the PVC Gilbertson nest box, Troyer nest box, and Gilwood designs have gotten encouraging results. Small nest-volume box, preferably with a Peterson-oval portal, designed for easy, and economical shop production. I built 20 of these and after putting up many and giving a few to relatives, these extras are for sale. The box design is supposed to deter English sparrows, while the metal pipe keeps many predators from climbing up into the box. DIY Simple easy PVC bluebird and tree swallow nesting box. Why you must shop now for the best birdhouse-feeder gifts, Get the promo code before it expiresThe Gilbertson-style PVC pipe nest box with a 1 1/2 inch round entrance hole (see my pick here) Each of these styles of nest boxes work very well at attracting Eastern Bluebirds. 90 ( $49. Both the Gilwood and Gilbertson have small interiors. STEVEN GILBERTSON (CHIEF EXECUTIVE OFFICER) GILBERTSON NEST BOX COMPANY: MINNESOTA BUSINESS CORPORATION (DOMESTIC) WRITE REVIEW: Address: 35900 Dove Str Aitkin, MN 56431: Registered Agent: (Optional) None Provided: Filing Date: September 11, 1997: File Number: 9U-850: View People Named Steven. 5" wide). 00. The wooden fence post does not exclude predators. A Safe, Sparrow-resistant Nest Box Sparrow-resistant boxes are criticial to keep out the Bluebird’s deadly nemesis: The House Sparrow! We recommend Slot Boxes or the Gilbertson Nest Box along with dedicated monitoring. Open nest box door and lay pattern on inside of door with edge marked “Top” towards the hole. Wednesday, November 15, 2023. For more on this, ask us at the store or see our web page “House Sparrows: Deadly Foreign Invaders. Gilbertson Universal Sparrow Trap Installed inside box just below entry. Initial studies suggested the Gilwood box marked an improvement over other nest-box designs. Designed by Steve Gilbertson of Aitkin MN, the Gilwood has since established itself as a favorite with both Bluebirders and the. I live in Minnesota. Leave a Reply Cancel reply. That’s the short. For slotted boxes, no one factor seemed to predict success. -----. If I bought ONE box for Eastern bluebirds, it would probably be a Gilwood (which they seem to prefer in my experience) or maybe a Troyer (a box used successfully by Bluebirds Across Nebraska - see info). . Everything you need to mount your bird feeder or nest box securely! Easy Assembly Heavy Duty Black Powder Coated Steel Construction Strong 3 Piece 1" Diameter Tubular Pole Ground Stake Drives 17. Oct 30, 2012 - 2020 holiday shipping is no laughing matter. Certainly many thousands of birds have. The Gilbertson PVC nest box features a western red cedar or brown poly-wood roof. in; drop: variable from 5" to 8 1/2". Wren, Chickadee and Other Small Birds with This Beautiful Nest Box. The bluebird parents take turns bringing bugs to the nestlings all day long. com) The Gilbertson bluebird house is mostly made from PVC pipe! The pipe detaches from the wooden roof to monitor bluebird nests quickly and easily. An Eastern Bluebird pair arrived on March 2, 2016. Nameholder at Walt's · Willmar, Minnesota. This is another feature of Steve Gilbertson's Gilwood (which was actually an improvement by accident and not by design, according to Steve). Often painted to look like birch, interior brown to darken. Gilbertson boxes are used by birds starting in April. Forty-two nest boxes were placed in late Mayon random fence posts and trees with little consideration of habitat needs. Remove it (and the used nest) immediately after fledging to encourage another brood, and to avoid HOSP becoming accustomed to it. When painting boxes use light-colored paint. Yes, yes! The very best quality and the best price are here, promise!. Cut the. Keith Kridler of TX has had HOSP nest in boxes with an exact 1 3/16" hole. . Boxes that Tree Swallows nest in should have "kerfs" or grooves (saw marks about 3/4" apart) or 1. USE OF GILBERTSON PVC BOXES Although Gilbertson PVC boxes are not 100% sparrow resistant, House Sparrows seem to be reluctant to use them. The supplies can be purchased for a relatively affordable price at most hardware stores. Steven Gilbertson Social Studies Teacher at WSHS (5-12 Certified)- Varsity O-Line Coach at WSHS- Varsity Assistant Baseball Coach at WSHS Winona, MNA method that works well for mounting lightweight boxes (like Gilbertson PVC boxes) is to use a 5-foot piece of ½-inch. 7% higher than nests in boxes without guards. Birch-like log base. Apr 26, 2018 - Below are simple, free bird box (birdhouse, nest box) plans that can be used to attract bluebirds, swallows, chickadees, nuthatches, warblers, woodpeckers, wrens, and other birds to your backyard or garden. I usually clear out stick nests, but leave them if there is an actual cup nest. Sparrow-resistant boxes are criticial to keep out the Bluebird’s deadly nemesis: The House Sparrow! We recommend Slot Boxes or the Gilbertson Nest Box along with dedicated monitoring. #8 X ¾” self-tapping sheet metal screw, installed when. NABS Fact Sheets & Plans. Shop The Birdhouse Chick today!First, check that the cam is working before you install it in the box! Most cameras can be mounted to the underside of the nest box roof with a few screws. Gilbertson style PVC. But until now, it wasn’t clear how well these nest guards worked, said Bailey. the box an d the piace one Marion by placing tha upside40vm . The entrance to the nesting box should be about 5-6 feet above the ground. Small Business Owner at Gilbertson Nest Box Co Osseo, MN. All boxes should be installed. The Birdhouse Chick. Don’t put anything in your bird box (birds are clever an resourceful enough to build. Safe, Private Shelter – A clean, Sparrow-resistant nest box placed away from feeding stations. side of box Paint inside dark color Secure bottom with 2 screws 2x2x71/2" 9" 71/2" Screws # 8 x 1" - Truss or (washer head sheet metal screw) 3/4" hole 1/8" hole Gilbertson PVC Nest Box with Conduit/Rebar Mounting System Bottom screw replaced with longer screw Drip edge Screw to keep box from turning on conduit Recent research using NestWatch data suggests that, on average, nests in boxes with predator guards had success rates 6. The size of the entrance hole can be adjusted from 1¼ to 1 3/8. Consider using a PVC-style bluebird house, like the “Gilbertson” nest box My “Gilbertson” nest box in mid-winter. 18: All 5 babies are still in the nest, eyes open, fully feathered. A GILWOOD BLUEBIRD NEST BOX Assemble the box using wood screws and glue. It is usually made of wood but can be made of plastic or even from cardboard. The bluebird parents take turns bringing bugs to the nestlings all day long. Among available natural cavities, bluebirds typically select old woodpecker holes in dead pine or. Challenge #2. Macrame Bracelet Diy. g. Sep 25, 2016 - Free nest box plans for Bluebirds and other small cavity-nesters. Thank you David. long, 8. Why you must shop now for the best birdhouse-feeder gifts, Get the promo code before it expiresGilbertson Nest Box Company was founded in 2009, and is located at 35900 Dove St in Aitkin. 5 bluebird bird houses nest box cedar peterson oval. 375" x 2. Use wire cutters to trim out the rectangle. Take a peek at eggs or. This front-door bluebird abode. We have used steel pipe for many years and are quite satisfied. 00. 5 – 3″ between the guard and the nest box entrance hole. . Drill a 5/16" hole through nestbox back and pole. Cut the top piece of the nest box, 11 1/4" x 11". Insert 1/4-20 x 2 1/2" machine screw and secure with washers and nut. The roof designs are invertedNesting Habits of the Tufted Titmouse. " I currently have two bluebird boxes that are being claimed by one house sparrow pair. This box has a shallow 4 1/2 inch drop from the bottom of the entrance hole to. The bluebird parents take turns bringing bugs to the nestlings all day long. It is another of the "less is more" type of nest boxes in that the relatively small inner nesting space is being found to be more successful than larger cavities. If this is tested as true, then the. As for the exact nest placement, titmice don’t. One week later they had completed their nest. This will be an opportunity to learn about bluebirds, their lifestyles and their habitat. 11) Mountain Bluebird Nest Box. Drill at a slight downward angle, going through the front of the house and into the side. . Abundant Food – Please do not use pesticides and deprive Bluebirds of. This video demonstrating how to mount a Gilbertson Bluebird House. 90 $49. Share with:Tree Swallow nestlings must be able to fly well from the moment they leave the nest in order to fledge successfully. Nests are padded with hair, fur, string and other soft material. Dec 31, 2012 - These Gilberston Nest Boxes really entice Bluebirds and their secure, warm construction allow for many broods to live in these great NABS Approved bluebird boxes. Peterson) the floor area is calculated at 2 1/2" below bottom of entry. Each of these nest box styles work well for Eastern Bluebirds and they have proven successful at attracting bluebirds in Ohio. Bed & Breakfast by Troyer Martin Feeder. com Find more info on AllPeople about Steve Gilbertson and Electramatic, as well as people who work for similar businesses nearby, colleagues for other branches, and more people. See Comparing Pros and Cons of Various Predator Guard Styles. The plastic pipe material and the shallow depth from the entrance hole to the nest box floor. High degree of house sparrow resistance while being highly desirable to bluebirds, tree swallows, chickadees and wrens. Gilbertson Bluebird Nest Box in PVC-NABS Approved. Sparrow-resistant boxes are criticial to keep out the Bluebird’s deadly nemesis: The House Sparrow! We recommend Slot Boxes or the Gilbertson Nest Box along with dedicated monitoring. Touch device users, explore by touch or with swipe gestures. They are intelligent and are good climbers; they can reach into a nest box hole and remove its contents. This model includes a stay-clear, crack-resistant viewing window to allow for nest viewing. Bluebird Nest Box. Use duct tape along the top to. Gilbertson boxes, Gilwood boxes, and Troyer boxes (just to name a few) have all proven to be attractive to bluebirds and less attractive to house sparrows. There's a beautif. , a 2-4 ft. Nest boxes provide cavity-nesting species the option to choose among several nest sites. Shop The Birdhouse Chick today!Building bluebird nest boxes are a great way to help conserve birds at the local level. When bird enters nestbox it trips arm, releasing the band which closes over the entry hole. Forty-two nest boxes were placed in late Mayon random fence posts and trees with little consideration of habitat needs. If placing new boxes, be sure they face the openness of a yard, meadow or field. With sheltered boxes like this, a flock is more likely to move in this time of year. If you want to build your own nest box, take a look at the detailed nest box plans that I currently recommend on my website. Download plan: 170kb. At the time of organizing back in the 1970s, BBRP was the first state bluebird organization in the nation. (1/2" space over door). My husband and I spy a male and female bluebird couple hanging around our one Gilbertson nest box. Bluebird Houses with side door or Gilbertson Nest Box are best. . Everything you need to have success about bluebird houses! Includes PDF plans, DIY picture tutorials & the BEST pre-made nest boxes. The roof designs are inverted As for the exact nest placement, titmice don’t seem to be very choosy. Floors not smaller than 5″ x 5″. In both studies, the Great Tit was the most common species occupying nest-boxes, with an occupancy percentage that varied between 7% and 11%. Watch ( and listen) for Male Bluebirds, alone on a high branch singing to attract a mate. This was an interesting nesting attempt in that it started out with what appeared to be a house wren dummy stick nest. Gilbertson’s box traps from Steve Gilbertson, HC 5 Box 31, Atkin, MN 56431, (218. PVC-style bluebird houses, like the “Gilbertson” nest box, have been shown to be very effective at deterring house sparrows. 7) Gilbertson Bluebird Nest Box. Aug 14, 2016 - These Gilberston Nest Boxes really entice Bluebirds and their secure, warm construction allow for many broods to live in these great NABS Approved bluebird boxes. Complete nest failure was more common in slot boxes, potentially due to more exposure to the elements. DutchCrafters Gilbertson Bluebird House: $39. 0, Sept 8, 2011Page 1 of 1 1/2" EMT Coupling Longer screw at bottom 1/2" EMT Conduit 5 ft. More expensive and complicated (need table saw and miter), can be expensive to purchase. Now with optional poly-lumber matching roof. Sep 25, 2016 - Free nest box plans for Bluebirds and other small cavity-nesters. . Mountain Bluebird s need a 1 9/16" hole), ventilation, drainage holes, and make it. Probably the most commonly used are NABS, Peterson, Slot, and Gilbertson. 5-2" wide x 6" long plastic screen (gutter guard) stapled tightly inside below the entrance hole to enable fledglings to exit. This is not a certain method, since HOSPS will nest in PVC boxes, but they don’t seem to prefer them. -----. Vinyl Bluebird House $109. long, 8. The Gilwood represented one of the most radical changes in bluebird nestbox design since manmade nesting structures were first erected for Eastern Bluebirds in the 1930s. 00 Copper Roof Birdhouse 28x10-Patina $295. Gilbertson nest box near creek. by Fred Stille and Steve Gilbertson. g. This model includes a stay-clear, crack-resistant viewing window to allow for nest viewing. plus a. Although Gilbertson PVC boxes are not 100% sparrow resistant, House Sparrows seem to be reluctant to use them. This nest box was designed by Steve Gilbertson, who also created the Gilbertson nest box mentioned above. We hope all the birds have a warm and comfortable home. 8cm) diameter. PVC is weather resistant, so the boxes will last a long time with minimal maintenance. 3x4" unfinished : Slanted roof and front. Find a NABS Approved bluebird house or PVC and copper bluebird house, cool bluebird homes in wood too. Interior floor space: 5 inches by 5 inches to accommodate broods of five to eight chicks. . 3. The entrance to the nesting box should be about 5-6 feet above the ground. Feb 16, 2020 - These Gilberston Nest Boxes really entice Bluebirds and their secure, warm construction allow for many broods to live in these great NABS Approved bluebird boxes. Position boxes in open areas at least a hundred yards apart. It features a viewing window plexiglass inserted behind the door so that you could look at the nest and babies without disturbing them. Gilbertson PVC Bluebird Nest Box PDF (Nestboxbuilder. If installed afterwards, it will not be effective. Preferred by blues over the years, cool birdhouse mounts quickly and easily on 1/2-inch. Find more bird houses plans or discover more bird houses and bird feeders. g. S&S Controller; Bait Traps; Gourd Traps; House Traps; Nest Box Traps; V-Top Trap; Decker J-Clips; Accessories. If installed afterwards, it will not be effective. METHOD Nest Box Design and Installation 37 pairs of Gilbertson and Peterson nest boxes were You may know the name for his famous nest boxes, but The Gilbertson bluebird feeder has actually been around for years. Sit Back and Enjoy Bird Watching From the. 8 Wide X 13 Deep X 22 High. 7) Gilbertson Bluebird Nest Box. 3 – Use a 2×4 to fold the hardware cloth into a box. For Eastern bluebirds, a 1. Birdhouse Ideas. In April I added a Gilbertson nest box, which was designed for Bluebirds, but accommodates other cavity nesters such as Tree Swallows, Black-capped and Carolina Chickadees, Tufted Titmice, House Sparrows and House Wrens, to name a few. Boxes placed in or around residential areas are likely to be claimed by House Sparrows. Recently manufactured and updated, it's constructed of poly-lumber (or recycled plastic) to last a lifetime. nicknackhummer. See Comparing Pros and Cons of Various Predator Guard Styles. Features: The entrance hole size is 1-½" Depth of the compartment is 6-¾" width is 4"How to Do It: Acetate sheets can help prevent snakes from accessing tree-mounted nest boxes. • Temperature is a likely mechanism underlying any differences between the boxes during egg/chick development, and should vary between box designs. Learn more. 4. the box an d the piace one Marion by placing tha upside40vm . 8. To install a nest box on a pole, check out this instructional PDF. so little time! READ MORE. Consider using a PVC-style bluebird house, like the “Gilbertson” nest box My “Gilbertson” nest box in mid-winter. Note the predrilled 3/4” hole on the mounting block. A house with side door makes for easy monitoring, as does the famous Gilbertson Nest Box. Therefore, box designs should be tested more widely to. There are 31 other people named Gilbertson Steve on AllPeople. Comments from Bet. Bluebird Nest. What is a Gilbertson nest box? The Gilbertson PVC nestbox is made from white 4-inch- diameter PVC sewer and drain (S&D) pipe The walls are barely more than 1/16 inch thick and will be slightly less heat resistant than the heavier walls of Schedule 40 PVC pipe. This is how to do a nest check on the Gilbertson Bluebird house. Metal band made from piece of retractable tape measure is bent down to engage wire retaining arm. long Polish with steel wool and apply wax 1/2" rebar 4 - 5 ft long Used as stake 1/2" EMT Brackets (2) Attach with 3/4" screws Gilbertson Conduit. My husband is holding the Gilbertson nest box while I take a quick photo. To install a nest box on a pole, check out this instructional PDF. On Saturday, April 3, from 1:00 – 2:30 p. 8267; Nestbox Builder - Fred Stille makes HIGH QUALITY standard NABS style boxes, X-boxes and a Gilwoods, and custom designs. Watch. joevic350. Aug 14, 2016 - These Gilberston Nest Boxes really entice Bluebirds and their secure, warm construction allow for many broods to live in these great NABS Approved bluebird boxes. Bluebird Houses. He had made it to the top . , a 2-4 ft. The wooden fence post does not exclude predators. For hole boxes, temperature and feeding rate affected fledging success. (Note: some. A GILWOOD BLUEBIRD NEST BOX Assemble the box using wood screws and glue. Some birdhouse landlords share that they use pellet guns to eliminate house sparrows. The Registered Agent on file for this company is (Optional) None Provided and is located at 35900 Dove Str, Aitkin, MN 56431. Insert the nail to hold the side door closed. If I had House Sparrow problems, I would go with a Gilbertson PVC. The idea is to place the pins or screws about 1 3/4″ apart on the front of the nest box roof, on either side of the entrance hole. Select a durable, waterproof nest box. Gilbertson Trap – This trap works on any style box and has a small piece of metal measuring tape that springs shut to close off the hole to the box and trap the HOSP. Gilbertson nest box with Vern's Clydesdale mare, Doll. Each of these nest box styles work well for Eastern Bluebirds and they have proven successful at attracting bluebirds in Maine. 5 acres for 5 nest-boxes, 2017 saw 13 Bluebirds and 20 House Wrens fledged from the new boxes. Eastern Bluebird babies in a Gilbertson nest box. Either a Stovepipe (Kingston) or PVC wobbling baffle will guard your nestbox against climbing predators like raccoons and cats. House Wrens. Use wren guards on active bluebird houses. It needs to face the right way. When many other states created their own bluebird clubs. The (2x2) is predrilled for ½ inch conduit mounting and received the enthusiastic endorsement of Keith Radel (BBRP). Find and reach similar companies by location, industry or both. House Sparrows can fit through entrance holes as small as 1 1/4”, therefore most cavity-nesting songbirds using nest boxes are vulnerable to House Sparrow competition.