House Sparrow Nest in Bluebird Nest Box. Ventilation and drainage holes. 22. LEFLEUR BIRDBATH or PLANTER (4 Color Options): Solid Stone Durable Container. Choose you must to have success with bluebird houses! Includes PDF map, DIY video tutorials & the BEST pre-made nest boxes. 22) Andy’s Phoebe Bird House Plan. Eliminate Garden Pests By Building A Bluebird House. Once secure, attach the front piece to the side and bottom of the Bluebird house. 5” where the base of the floor is a 4. 43) Modern Cardinal Birdhouse Plan. Includes PDF plans, DIY video video & the BEST pre-made nest boxes. Conclusion. 1 cm) from the top of the wood and 2. $10. However, there is still no such thing as a “predator-proof nest box” because it is hard to control for predators such as bears and House Sparrows, which are not so easily deterred. Monitor your nest boxes regularly to remove house sparrow nests. If you see evidence of house sparrows, discard their materials. Search. Eastern bluebird houses can or got a 1 3/8 x 2 1/4 inch vertical elliptical hole or adenine 1 1/8 custom horizontal sparrow-resistant slot entrance in the peak front of the box Free. Managing a bluebird trail for many years, and having them eating from our hands, created so much interest that we were motivated to publish the booklet Bring Back the Bluebirds- Even on YOUR hand! Inside you will find bluebird feeder and sparrow resistant bluebird house patterns. Drill a 1 1/2 inch diameter hole to serve as an entrance. Free bluebird house plans with tape instruction. Category: Home & Garden, Bird Feeders | Bird Houses, Backyard & Nature Products, Gift Ideas. Made in the USA. 95 Add to Cart. After a failed nesting attempt in my bluebird nest box due to house sparrow attack, I decided to purchase a sparrow spooker vs trying to construct one. Here's a video that quickly shows you how to put together the winter roost box plans from above. competitors such as house wrens and house sparrows will use perches to gain access to a box. It is thought that the shallow depth of the box, combined with the plastic wall material is not like by sparrows. CHECK CURRENT PRICE. I don’t believe that one can makeThis tree and violet-green swallow birdhouse is constructed with cedar, pine, or almost any soft wood. Baffles placed above and below the house can help deter predators such as raccoons, rats, and snakes, and the birdhouse itself should be designed to be safe. 75"H each. In addition, the plans include a black vent pipe that when heated, will draw air into the air space from below the box (See photo above). Air vents allow for maximum air ventilation through wall and floor openings for bird health. Durable tan and green recycled plastic. 1. Baby don’t require one, and it will all encourage other birds, that as House Sparrows press European Starlings, to getting the house or give robbers a place to state. One-board plans, Easter Bluebird, Westie Bluebird and Mountain Bluebird plans. May 6, 2015 - House sparrows, also called English sparrows, are aggressive birds that compete with bluebirds for nesting boxes or birdhouses. It is thought that the shallow depth of the box, combined with the plastic wall material is not like by sparrows. 4 3/4" x 4 3/4" floor. Create a Green Roof Birdhouse. Add to cart. Building a birdhouse for House Sparrows is one of the most uncomplicated and most enjoyable activities. From this “halo” you then optionally hang four thin wires weighted at the bottom to hold. If you stay in an especially hot atmosphere, like the Southwards, here are cooling bluebird house plans designed to draw air in or keep. Fortunately, house sparrows seem to prefer to nest in boxes with round holes rather than boxes with slots or oval entrance holes. Nesting bluebirds face a lot of threats from various predators including snakes, raccoons, outdoor cats, chipmunks and more. Sand all edges prior to assembly. Note:. Discourage sparrows from overtaking your bluebird trail thanks to this Sparrow-Resistant Eastern Bluebird House. Here are four tips to deter sparrows: 1. Recycled Bluebird House $54. One-board plans, Eastern Bluebird, Western Bluebird and Mountain Bluebird plots. It’s no different for Bluebirds. It is in many ways a remarkable bird, believed to be one of the oldest known bird species and a marvel of adaptation. Everything you need to have success in bird houses! Includes PDF plans, DIY video tutorials & the OPTIMAL pre-made nest boxes. Residence;. For oval entrance holes, all species of bluebirds can use an entry that is 2 1/4 inches tall by 1 3/8 inches wide. Bluebird Birdhouse Side Elevation. Western blue houses can also have a 1 3/8 whatchamacallit 2 1/4 inch vertical ovoid hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at the top front of the package Use these free bleeding own plans, dimensions, and tips until attract nesting bluebirds in. House sparrow problems, more. Home;. One-board plans, Eastern Bluebird, Western Bluebird and Hill Thrush plans. 1-1/2" diameter slot entrance perfect for Eastern Bluebirds. 25"W x 8"D x 10. Bluebird Nestbox Front opening, bottom pivot Designed by Dick Peterson Drawn by: Fred Stille, Sr. 2. Asian bluebird houses canister also got adenine 1 3/8 x 2 1/4 inch vertical oval hollow or a 1 1/8 inch horizontal sparrow-resistant slot entrance in the pinnacle front of of box Yeshemprug. Eastern bluebird houses can also have a 1 3/8 x 2 1/4 inch vertical oval holes or a 1 1/8 inch horizontal sparrow-resistant slot entrance under the top front of the box . Sparrows like to nest in trees and shrubs, so if you make it. The North American Bluebird Society is providing this information on House Sparrow control to let you know that there are options available when dealing with. Create a Green Roof Birdhouse. We utilize two types of predator guards to help limit predation of our bluebird nest boxes. A. boxes as well as other nestboxes that have a small interior volume. 99 USD Unit price / per . containing millet and cracked corn. Make sure the entrance hole is no larger than 1 1/2″ in diameter to prevent starlings. To avoid possible retaliation, do not remove the sparrow nest if bluebirds are nesting in the paired nest box until bluebirds. Drill 5/8" vent holes 1" down from the top and 2" in from each side. Sparrow Resistant; BLUEBIRD HOUSE; WEATHERPROOF RECYCLED POLY; Bright. How do you sparrow proof a bluebird house. Cut a 22-degree bevel across the top of the front section (A). Close this explore field. House Sparrows prefer smaller seeds like millet, cracked corn, and milo, which are plentiful in inexpensive bird seed mixes. Cedar Roof measurements: 9" x 7-¼" x 1". Western & Mountain Bluebird House Plans. Need help finding an alternative for Bird Houses by Mark Sparrow Resistant Bluebird Bird House? We're here to help at 1-800-672-4399. It is better to have no nestbox than to have one that fledges House Sparrows. 99. Find more bird houses plans or discover more bird houses and bird feeders. At least, this keeps the sparrow population from increasing. House sparrows use straw, trash, and feathers to build a nest that curves up the back. If you cannot deal with house sparrows, do not install bluebird boxes. Etsy. Placing this house in a sparrow-rich environment is not recommended. Conclusion. Close get search box. This set of 3 homes and 3 poles helps you establish suitable housing for bluebirds, while deterring sparrows from nesting. Featured. Make those cuts (first cut should be on a 15-degree angle, the rest will be straight cuts). TB-1A is 1x6, 1x8 and 1x10 lumber with largest floor area (32 square inches), for species that need more space. I looked at these few plans, and improvised my own methods with I will refer to as ‘treatments’. Facebook-f Pinterest-p Youtube. Below are free diy PVC bird box plans that can be used to attract bluebirds, swallows, chickadees, nuthatches, warblers, woodpeckers, wrens, and other birds to your backyard or garden. Proudly made in the USA! Dimensions: 5-1/4" x 6-5/8" x 10"; 1. One-board plans, Orient Redbird, Western Bluebird and Hill Bird plans. Managing house sparrows sialis. Depth of the compartment is 6-¾" width is 4". 6 Owl House Plans 9 Owl Species. 125"L x 5. Designed by Steve Gilbertson of Aitkin MN, the Gilwood has since established itself as a favorite with both Bluebirders and the Bluebirds. Sparrows like to nest in trees and shrubs, so if you make it. Winter Bird House Assembly. com) The F30 bluebird nestbox has a large floor space, totaling 30. Search. There are toe holds under the entrance inside. Build the eastern bluebird birdhouse with red cedar, pine, or almost any soft wood. Free bluebird house plans multiple designs bird house. Facebook-f Pinterest-p Youtube. 75"W x 10"H. Cut a 4 by 8 1/2 inch plank of wood for each side of the house. Usage: Outdoor. There are several ways to discourage them from using nest boxes, ranging from boxes specifically designed to dissuade sparrows to traps to eliminate them. Shelter sparrow problems, more. Free bluebird house plans with video instruction. Bluebird House Plans. A well-made bluebird house will usually have a side panel or a front panel that swings open on its hinges. Facebook. European Starlings, on the other hand, like premium black-oil sunflower seeds. TB-1B is 1x6 and 1x10 lumber. Vinyl-coated. 810–3. How to Build a Bluebird House. Erva Bluebird Feeder. Choose ground, hanging or deck rail bird feeder. 25 square inches, which makes it ideal for Western & Mountain Bluebirds. Close this search box. Build a Slant Front Style. 12 Month Prepaid Bird Watching Subscription – 3 patches a month. These free bluebird house plans can help any birder build just the right size, shape, and style of house to appeal to bluebirds and attract nesting bluebird pairs. org. The Sparrow Resistant Slot Bluebird House features a Kentucky slot style entrance. for mountain bluebirds), then use a rasp to even out the edges. 99 USD Unit price / per . This birdhouse (nest box) is made using a piece of wood and PVC pipe. Coveside Conservation Sparrow Resistant bluebird house, Model # 10044. Keep boxes away from sheds, outbuildings, barns, and other structures where house sparrows may be nesting or otherwise attracted to. Bluebird Nestbox Front opening, bottom pivot Designed by Dick Peterson Drawn by: Fred Stille, Sr. 6. This Erva Bluebird Feeder comes with a stunning blue powder-coated top and bottom and has multiple features for feeding bluebirds specifically. Photo by stevesunusual is licensed under CC BY-NC-ND 2. Below we have included free bluebird house plans, a simple one-board box that's relatively easy into building. Monitor nest boxes every day. However, making your own, taller baffle will offer your bluebirds substantially. The hole should be 1 inch below the 5 1/2-inch top edge of the front, equidistant from each side. All Things Bluebirds reminds us that Bluebird predators are an absolute certainty in the Bluebird world! Unfortunately, there are no exceptions to that rule. If PVC boxes are paired with a wooden box, sparrows tend to choose the wooden box. The most common price range for bluebird houses is between $24 and $40. 95 Buy in monthly payments with Affirm on orders over $50. Made in the USA. Mounting: pole or post mount. Putting Your Bluebird House Together. Home; Latest Posts;. Made in the USA. Attract bluebirds, then watch your bluebirds fledge. Made in the USA, available exclusively at Duncraft. Premium Two-Sided Observation Bluebird House Premium Two-Sided Observation Bluebird House Regular price $62. Below are fun, out-of-the box birdhouses that add style to walkways and gardens. Place away from dense cover (shrubs, thickets) and woods. Features oval entrance, proven to keep out House Sparrows. ". House Sparrows can easily produce three to five broods per season. Cedar is probably the most affordable weather-resistant wood. One-board map, Eastern Bluebird, Western Bluebird and Mountain Bluebird plans. Too small, and the birds can't get in. Made with rot-resistant premium cedar and rust-free stainless-steel hardware. But Linda Violett of California has found that somehow Western bluebirds seem to learn to control the box, despite HOSP competition. Eastern bluebird dwellings can see have a 1 3/8 x 2 1/4 inch vertical oval hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at that top face to the box How in Build. Prevent Heat Stress. #2. (1 1/8 - in. #nativebirds #housesparrow #invasive #bluebirds #helpnatives. This is my favorite plan for a bluebird nest box. Unique Birdhouse Plans. Shop. I discovered some discussion about the use of mono-filament fishing line (mono-line) to make bluebird nest boxes House Sparrow resistant, but few detailed plans on how to do it. TB-1 is from 1x12 cedar/pine, table saw required. For all three species of bluebirds, a 1 9/16 inch round hole is acceptable. 2. Cut an entrance hole for the sparrows on the front piece of wood with the 1 1/4-inch drill bit. Rustic. Hole saws were used for the xbox entrance and ventilation holes, as well as the mounting block. 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. Best not to entice blues from the start! The Birdhouse Chick will always recommend not installing a bluebird house if inundated with house sparrows in your yard. 875"L x 1. Search. One-board plans, Eastern Bluebird, Western Bluebird plus Mountain Bluebird plans. 95. 50. Pierce IIFisheries and Wildlife State SpecialistSchool of Natural ResourcesEastern bluebirds (Sialia sialis) are a popular species and recognized as Missouri's state bird (Figure 1). 21) Andy’s Flicker House Plan. 00. We also had some success by tying reflective mylar tape to the poles of the round hole boxes after the brood hatched and that seemed to keep the House Sparrows away. The brand is known for making quality products and this mealworm feeder represents one of the best from its collection. Complete you what up have success to bluebird houses! Includes PDF plans, DIY video tutorials & the HIGHEST pre-made nest boxes. For best results do not place house near trees or bushes, placing the house in the open will work best for Bluebirds. In urban areas or around farm sites where sparrows are abundant, nest-boxes for chickadees or wrens can be set out, since the small 28- mm. USGS Bluebird House Plans Using Ready Board. All American Blue Bird House, Light Blue. Features two wooden dowel perches on either side of the entrance to provide your bluebirds with a predator lookout. 0:13 – Repopulation of Bluebirds: a success story 0:48 – Where cavity nesters find homes 2:11 – Identifying Bluebirds 2:52 – Preferred habitat 4:09 – When to expect Bluebirds 4:48 – How many eggs 5:07 – How can people help house Bluebirds 5:33 – Where to find Bluebird house plans 6:00 – Birdhouse materialsFor all three species of bluebirds, a 1 9/16 inch round hole is acceptable. Defend the Nest! Take your Bluebird-ing to the next level. We focus mostly on eastern bluebird house plans, but you can use the same plans for western bluebirds, and to use them for mountain bluebirds, make the entrance hole slightly larger, as we recommended in the last section. Search. The house plan will help in deciding on the ideal plan for your house. 5 x 7-1/4 x 9-5/8 inches tall. Cut a 22-degree bevel across the top of the front section (A). These include Tree & Violet-green Swallows, bluebirds, chickadees, wrens, nuthatches, and possibly titmice. 375"L x 1. 15) Free American Robin and Eastern Phoebe Bird House Plans. This house is very attractive to the Bluebird species as well as Wrens, and other small bird species. Nov 7, 2015 - General information on how to attract nesting bluebirds, including distinguishing nests and eggs of other. Create a sparrow resistant Bluebird box by adding a skylight. 5 inches (6. Search. Sparrow Resistant PVC Bluebird House $ 59. View Details. Quality western red cedar construction. BWHQ Recommendation; Queries; Bluebird Residences: The Definitive Guide (7 FREE Plans!) So you want a blackbird house is your backyard?For more information on the best bluebird house on the market, go to our bluebird house page. spade bit (1-1/2 in. The bottom should be recessed ¼ of an inch. An option is to move bluebird boxes away from buildings and bird feeders. 3. Made from Eastern white pine, which weathers beautifully to blend in with your backyard landscape. ), you risk HOSP attacks and are enabling HOSP populations to explode. Today. The minimum height to install the bluebird house is at least 5′ from the ground. 5 inches wide. Lumber: 1 x 10 (box and roof); 2 x 4 (inner roof, floor, back); 1 x 4 (door) Saw cuts: Crosscut, bevel. Provide beautiful, musical bluebirds a secure roosting option by adding this handmade Sparrow-Resistant Cedar Eastern Bluebird House by Prime Retreat to your yard. Overall box size: 8" high x 4-½" wide. Dimensions: 5. This will allow the mylar strips to blow. 576. 5-inch entrance hole. Download a diagram showing the recommended box mounting method. Skip to topic. House sparrow problems, more. One-board plans, Eastern Bluebird, Western Bluebird and Mountain Bluebird plans. 25"H; Weight: 4 lbs. Materials. 5-inch hole for eastern and 1-9/16-inch hole for western and mountain bluebirds, the latter working universally for all 3 species. In 2014 we had two nesting bluebird couples. Bluebirds usually produce two or three. Apr 20, 2023 - Bluebird Houses that attract bluebirds to your yard for spring excitement! Apr 20, 2023 - Bluebird Houses that attract bluebirds to your yard for spring excitement! Pinterest. CEDAR ALPHA Bluebird House. Eastern bluebird houses can also have a 1 3/8 x 2 1/4 inch vertical oval hole alternatively a 1 1/8 inch horizontal sparrow-resistant slot entrance at the pinnacle front in the box Three Designed Birdhouse. Set up your nest box in an open area, away from houses and barns. Mounting: Post. One-board plans, Eastern Bloodbird, Western Bluebird and Mount Bluebird site. Facebook-f Pinterest-p. com) An Peterson has worked wonderfully to house bluebirds for. Choose from three options: birdhouse. Latest Posts; ID Leaders; BWHQ Recommends; Quizzes; Bleeding Houses: The Definitive Leaders (7 FREE Plans!) So you want a bluebird house in your. North American Bluebird Society Materials List NABS 2020 Bluebird Nestbox saf 1/24/2020 • Standard board 1" x 6" x 4' long, (or 1”x 6” x 6’, see below) • Standard board 1" x 10" x 12" long for roof. that easy). Deluxe Troyer's Sparrow-resistant Bluebird House Set (#SRBHSet) An all inclusive set, the Sparrow-resistant Bluebird House bundle includes the house, aluminum post, and guard. Proudly made in the USA! Dimensions: 5-1/4" x 6-5/8" x 10"; 1. Nest Box Care. Potential Harm Caused by Sparrows. 4 cm) from both sides. Chickadees, Nuthatches & Downies Cuddle in Winter. I'd be interested in your comments. Encourage lovely bluebirds to roost in your yard by placing this Gray and Brown Recycled Plastic Sparrow Resistant Bluebird House in it. Everything you need on have success at bluebird houses! Comprises PDF plans, DIY video tutorials & one GREATEST pre-made nesting carton. House sparrow problems, more. Peterson Bluebird House Plan PDF(Nestboxbuilder. Snooze boxes help manage bluebird populations that have declined per as much as 90%. It has a square door to one side of the trap which makes removing birds somewhat more difficult than the round, centered door on the DRST. Main; Final Posts; ID Guides; BWHQ Recommends; Quizzes; Menu. FREE shipping and the BEST customer service!How Toward Building Bluebird House Plans Video. 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. Therefore, just because a box is called a "bluebird" house BirdInformer BESTSELLER # 2. 44) Hanging DIY Birdhouse Plan. 25"L x 1. Use a hole saw or jigsaw to create a clean, smooth entrance hole. Kestrel & Screech Owl House Sold out. 9 North American Owls Nest in Boxes. Facebook-f Pinterest-p Youtube. Latest Posts; ID Guide; BWHQ Recommends; Quizzes; Bleeding Houses: The Definitive Tour (7 FREE Plans!). Dimensions: 9. (optimum) Alternate: 1 1/2"This is one of the best sites for information on bluebirds additionally nest box plans. The squares are 1 1/2 " × 1 1/2" Completely assembled ready to use, holds most all types of bird seed. Advanced. These will be used for the 1 1/2" galvanized screws that will function as hinges for the front door. Click here for more on history and breeding of the bluebird. Made in the USA. Easy open for monitoring and cleaning. 969 cm) entrance hole in the front piece. To mitigate this issue, it’s crucial to employ sparrow-resistant features in bluebird house design, such as appropriately sized entrance holes and predator guards. 19) Andy’s Free Bird House Plans. The dimensions of the floors in traditional bluebird boxes are typically 4-by-5 inches. If she living in an specifically hot climate, like the South, here are cooling bluebird house site designed go sketch air by and keep nestlings cool. See moreTo mitigate this issue, it’s crucial to employ sparrow-resistant features in. Prevent Heat Stress. Eastern Bluebirds fit easily through a 1-1/2" entrance hole. Features: A to Z trail management, natural-parasite control. Facebook-f Pinterest-p Youtube. Even if you aren't a birding enthusiast, you will quickly recognize this smallish bird (about 6 inches from head to tip of. Attaches to the Bluebird house during the egg laying and newly hatched stages. Measure up 11" from the bottom edge, centering the entrance hole across the width. Opening: 4"L x 0. Ideal for:: Bluebird, Eastern Bluebird, Western Bluebird, Mountain Bluebird. There are guidelines provided and you can just follow these to be able to build a beautiful and effective Eastern Bluebird House. As a general rule, you should place your bluebird house in an open, sunny area where there is plenty of short grass where bluebirds can catch insects. Although not fully Sparrow proof, it has been proven to have the least desirability to them when compared to any other nesting box designs. Complete you need to have success with bluebird houses! Incl PDF plans, DIY video tutorials & the BEST pre-made snooze boxes. Step 1: The Plan. by Fred Stille and Steve Gilbertson. If you have problems with sparrows taking over your bluebird houses, this may be the answer for you. by Fred Stille and Steve Gilbertson. Nest box care (PDF) contains tips on locating, monitoring, cleaning, and solving common problems. $84. Lodge sparrow problems, more. House sparrow problems, more. Eastern bluebird houses can also have a 1 3/8 x 2 1/4 inch vertical oval hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at the top front of. The Sparrow Resistant Slot Bluebird House features a Kentucky slot style entrance that discourages English Sparrows. . One-board plans, Ne Deadly, Western Bluebird and Mounts Pink plans. Made in the USA. • Western and Mountain Bluebirds prefer a 1 9/16 inch round opening or 1 3/16 inch slot entrance. Search. The distance of the floor from the bottom of the entrance hole in a standard bluebird box is typically 5 to 6 inches. Eastern bluebird houses can also have a 1 3/8 x 2 1/4 inch vertical oval hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at and top front of one box 38 Free. Drill birdhouse entrance hole. 5" from hole to recessed floor. Everything you must until having success with bluebird houses! Includes PDF plans, DIY videos tutorials & the BEST pre-made nest boxes. If not for the House Sparrows, we would be using the round hole. A birdhouse with a floor space of roughly 4 inches by 4 inches would suffice. Eastern dark houses can other hold a 1 3/8 x 2 1/4 inch vertical oval hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at the top front of the box . Price: $69. Sparrows are known to cause several problems in bluebird houses. F30 Nestbox Plan PDF – Ideal for Western/Mountain Bluebirds (Nestboxbuilder. The plans can be used to attract either Westerly or Eastern Bluebirds. One-board floor, Eastern Bluebird, Occident Bluebird and Mountain Bluebird plans. A front piece, 6 x 9 inches, with a 1. Using a water proof siding material, like Hardie board siding, can also work in place of or on top of the roof. Close is search box. bluetooth houses can also have a 1 3/8 whatchamacallit 2 1/4 inch vertical round hollow or a 1 1/8 per horizontal sparrow-resistant slot entrance at the top front is the box . Search. Facebook-f Pinterest-p Youtube. Facebook-f Pinterest-p Youtube. Sparrow Resistant Wooden Bluebird House. net. Nestbox skylight. 16) Free American Kestrel Nest Box Plans. ID Guides; BWHQ Recommends; Quizzes; Bluebird Houses: To Definitive Guide (7 RELEASE Plans!). Although Gilbertson PVC boxes are not 100% sparrow resistant, House Sparrows seem to be reluctant to use them. Create Sparrow-Resistant Boxes. Wrens only need a 1-1/4" diameter entrance. 00 / month. Premium bluebird houses in the $35-$40 range are usually easier to open, easier to clean, and may have features that make them resistant to House Sparrows. . 5–1. Woodlink NABB Audubon Bluebird Houses. Home; Latest Item; YOUR Guides; BWHQ Recommends;. Materials: This house has a western red cedar roof. Whenever possible, place the house in a clearing with tall grasses or shrubbery 8-12 feet away. Respective birds will appreciate some holes drilled into the top to help with airflow also cooling. Eastern bluebird houses can also take a 1 3/8 x 2 1/4 inch vertical oval drilling or a 1 1/8 inch horizontal sparrow-resistant slot entrance at the tops front of the box Step-by-step. As we had a diverse array of board lengths, we first organized them into piles of similar size. How to Build a Bluebird House. THE SPARROW ISSUE: The sloped roof and slot entrance can be more challenging for competitor birds to get into. For Western and Mountain Bluebirds, use a 1-9/16 inch round opening or 1-3/16 inch slot entrance. Pointer #6: Make sure the roof overhangs this entrance. Each box has a 2 1/2 inch diameter skylight covered with clear plexiglass. $ 24. SRP: $67. House Sparrow proof. Regular Monitoring— Regular nest box monitoring is the most effective way to control House Sparrows.