Build a Bluebird Box. Durable tan and green recycled plastic. If the entrance hole is too small, then the birds cannot get in. Made in the USA! Sparrow-Resistant Western Bluebird House Dimensions: 8. Nest Box Monitoring. The house itself is 8" long by 4. Skip to content. Latest Posts; DEVICE Guides; BWHQ Recommends; Quizzes; Bluebird Houses: And Ultimate Guide (7 LOOSE Plans!) So yours want a bluebird house in choose backyard?. Bluebird Nestbox Designed by: Andrew Troyer Drawn by: Fred Stille, Sr. Bird House Plans. Opening: 4"L x 1. There is also a great deal of satisfaction from seeing a family of young birds fledge from a box you built! We have included 3 very good and successful designs below that are all easy to build, except where noted. Made with rot-resistant premium cedar and rust-free stainless-steel hardware. 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 box . If you only want to provide houses for nesting, putting them up in late winter or very early spring will ensure they are available for even the earliest nesting species. Product Details. The next step to build a bluebird house is to cut part D from a 1×4 so the end is 45 degrees, and then reset your saw to cut the piece to final length. 5” and the walls are about 9” high. Price: $179. Drill a hole on the hinged side 2 inches up from the bottom and 1/2 inch in from the side. Two venting options. CEDAR ALPHA Bluebird House. Chickadees, Nuthatches & Downies Cuddle in Winter. Arizona house plans, floor plans & designs. E. Search. House Sparrow proof. For more information on this bird house please see Amazon link below: you need to have success with bluebird houses! Includes PDF plans, DIY video tutorials & the BEST pre-made hide boxes. FREE shipping and the BEST customer service!How Toward Building Bluebird House Plans Video. House Sparrows will readily use them in the absence of bluebird competition. Measure and Cut Bluebird House Door. Carolina Chickadee. Bluebirds usually produce two or three. Dimensions: 9. Many people are hesitant to exterminate a house sparrow or even remove a house sparrow nest. Use wren guards on active bluebird houses. Learn more at:The House Sparrows do not seem to be as interested in the slot type boxes. This reminds me of an old box designed by Vince Bauldry - the Bauldry open top - but this one won't let rain in. House Sparrow Nest in Bluebird Nest Box. Close this search boxed. Bluebird Inspect Chick House Before Making adenine Final Decided - "I likes the open floor plan. you will need to monitor the box and use the below tips to not attract starlings to your backyard. habitats. Give Bluebird House A Superior Look By Painting It. The tube shape paired with the coloring of this birdhouse represents the look of a birch tree. House Sparrows can easily produce three to five broods per season. A well-made bluebird house will usually have a side panel or a front panel that swings open on its hinges. House Sparrows tend to like them for whatever reason – so ditch the perch to get rid of House Sparrows. Overall box size: 8" high x 4-½" wide. House Sparrows are vicious competitors. Monitor your nest boxes regularly to remove house sparrow nests. However, there is a great “sparrow-resistant” nest box that a lot of folks have success with called the Gilbertson-style nest box. The house sparrow, Passer domesticus, is one of the most familiar, widespread birds in the world. Check out this video on Dean Rust's site (Dean is a county coordinator for the PA Bluebird Society). House Sparrow. 9 North American Owls Nest in Boxes. For further assistance, please use our Contact page. Gilbertson Bluebird House (Best “Sparrow-resistant” Bluebird House) Another popular style of nest box is the Gilbertson Bluebird House , which is made of thin PVC pipe. The common house sparrow can be invasive and harmful to native birds. Bluebirds will usually move into the HOSP-resistant box. from basic nest box to bluebird mansion! Vinyl Bluebird House $109. This set of 3 homes and 3 poles helps you establish suitable housing for bluebirds, while deterring sparrows from nesting. Q: Where and how should I mount my nestbox? A: Eastern Bluebird nestboxes should be spaced at intervals of at least 100 yards — 125–150 yards may be better. habitats. 5"L x 7. If you see evidence of house sparrows, discard their materials. Measure down the front panel 1 ¼ inch and drill two pilot holes. sjarrell / Getty Images Bluebirds are some of the most desirable cavity-nesting backyard birds, but they need a safe, attractive place to nest. for mountain bluebirds), then use a rasp to even out the edges. 1. 99 USD Unit price / per . This shelter, based on thorough research from the University of Kentucky, caters specifically to bluebirds and deters sparrows from nesting. Free bluebird house plans with video instruction. It is the only bluebird house that comes with vent plugs to block out blackflies when they become a problem. In this video, I build a bluebird house with slot entry. Either build a predator guard for the house entrance or buy one. Western & Mountain Bluebird House Plans. A horizontal slotted entrance at the top of this bluebird house allows light to enter, deterring sparrows which prefer darker areas. This box has a shallow 4 1/2 inch drop from the bottom of the entrance hole to the floor, and a small, round nesting cavity with a 4 1/4 inch diameter. 75"W x 10"H. CHECK CURRENT PRICE. Below are our top picks for attracting a variety of birds to your outdoor space year-round; plus you can find our 200+ styles of bird feeders, birdhouses, bird baths and accessories in-stores. Build a Bluebird Box. Dimensions: 5. $10. 25 $ 72. Eastern blackbird houses can also have a 1 3/8 x 2 1/4 inch vertical oval hole either a 1 1/8 inch horizontal sparrow-resistant slot entrance at the above head of the box . Eastern Bluebird. 1-1/2 inch slotted entry hole. Opening: 4"L x 1. It’s no different for Bluebirds. 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. Build a Bluebird Trail! Save $$ when you purchase multiple nest boxes. The Sparrow Resistant Slot Bluebird House features a Kentucky slot style entrance. 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. Although Gilbertson PVC boxes are not 100% sparrow resistant, House Sparrows seem to be reluctant to use them. Choosing a Bluebird House to Build The 10 DIY Bluebird House Plans. Overall box size: 8" high x 4-½" wide. Create a Green Roof Birdhouse. com. The plan above specifies a 1. Shop. 1. House sparrows, also called. Eastern bluebird houses can including have a 1 3/8 efface 2 1/4 inch vertical ovate hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at the above front of the box . In any mounting method, bird houses should be mounted approximately 5 feet off the ground. Version 1. One-board plans, Eastern Bluebird, Western Bluebird and Mountain Bluebird plans. One-board plans, Eastern Bluebird, Western Dark plus Mountain Pink schedule. Kestrel & Screech Owl House Regular price $79. But first, all you "Roll-tide" fans, brace yourselves. One-board plans, Eastern Bluebird, Western Bluebird furthermore Mass Bluebird plans. These “people” I describe represent the English House Sparrow, a. 25 square inches, which makes it ideal for Western & Mountain Bluebirds. Prevent Heat Stress. Build the eastern bluebird birdhouse with red cedar, pine, or almost any soft wood. Facebook-f Pinterest-p Youtube. Free bluebird house plans with record instruction. There are several ways to discourage them from using nest boxes, ranging from boxes specifically designed to dissuade sparrows to traps to eliminate them. Mounting: pole or post mount. A two-hole box is not technically a HOSP-resistant box. House sparrow problems, more. For more information on controlling house sparrows, please visit sialis. Each box has a 2 1/2 inch diameter skylight covered with clear plexiglass. Drill two ventilation holes with the 1/4-inch drill bit in each side piece. Search. Free bluebird house plans with view introduction. Eastern Bluebird Birdhouse. Bluebirds, chickadees, titmice, downy woodpeckers, and nuthatches can fit through a 1-1/2" diameter entrance, but this hole is too small for the larger sparrows and starlings to enter. 125"L x 5. Attract bluebirds or Tree Swallows to eat your insects. Step 1: The Plan. Step 1 ~ Buy some basic, cheap birdhouses! M…. Free bluebird house plans with video instruction. Bluebird Control Bird House Before Making a Last Decision - "I like the opens floor plan. Consider using a PVC-style bluebird house, like the “Gilbertson” nest box. One-board plan, Eastern Dark, Western Bluebird and Mountain Bluebird plans. Facebook-f Pinterest-p Youtube. com) An Peterson has worked wonderfully to house bluebirds for. The bottom should be recessed ¼ of an inch. 3 “sparrow-resistant” nest box designs (the pros and cons of each) #1. Although Gilbertson PVC boxes are not 100% sparrow resistant, House Sparrows seem to be reluctant to use them. Specifically invite bluebirds to nest in your bird garden with this Sparrow-Resistant Bluebird House. If House Wrens are likely to be a problem, be sure the box is mounted at least 50–200 feet away from a wooded orThis repeating elevator sparrow trap was about $70 + $10 shipping. Bluebird Residence Plans. Using a water proof siding material, like Hardie board siding, can also work in place of or on top of the roof. Bluebirds prefer to nest in open areas with low or sparse ground cover. 7. Home; Latest Posts;. Search. Erva Bluebird Feeder. Attached 14 x 14 vinyl coated basket for small song birds. BSP receives nothing in return for sharing this. Everything you need to have success in bird houses! Includes PDF plans, DIY video tutorials & the OPTIMAL pre-made nest boxes. 7-1/4 x 7 x 9-7/8 inches. Eastward bluejay houses cannot also have a 1 3/8 x 2 1/4 inch vertical oval perforation or a 1 1/8 infeed horizontal sparrow-resistant. 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. Too big, and the more aggressive starlings and sparrows will out-compete the little bluebirds. One-board plans, Eastern Bluebird, Westie Songbird and Climb Bluebird plans. In 2014 we had two nesting bluebird couples. Free bluebird house plans with view instruction. Price: $69. These include Tree & Violet-green Swallows, bluebirds, chickadees, wrens, nuthatches, and possibly titmice. Liberate bluebird house plans with video instruction. 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 . House sparrow problems, more. Price: $189. Use wood scraps and bluebird box plans to build a bird house in a lean-to shed design. Facebook-f Pinterest-p Youtube. The Sparrow Resistant Slot Bluebird House features a Kentucky slot style entrance that discourages English Sparrows. Gilbertson boxes, Gilwood boxes, and Troyer boxes (just to name a few) have all proven to be attractive to bluebirds and less attractive to. By 1900, the imported cavity-nesting House Sparrow had become a serious pest in most areas of the country. This bluebird house from Cedar Alpa is again made with premium red cedar wood, which is known for its weather-resistance features and durability. Dimensions: 4"L x 4. Opening: 3. Some studies have shown that bluebirds prefer a slot entrance to the standard circular hole entrance and sparrows prefer the opposite. Take down or modify any ornamental bird houses in your yard. Lumber: 1 x 10 (box and roof); 2 x 4 (inner roof, floor, back); 1 x 4 (door) Saw cuts: Crosscut, bevel. Large roof overhang and floor size. Keep parasites away from young birds in 4 different houses using these Classic Bluebird House Nest Lifts. More specifically, 5′ from the ground to the bottom of the birdhouse. Directions: Use the provided photo of my measurements and mark out your board (you really just have to lay a tape measure along your board and mark the top row. 25"W x 8. To keep starlings out of a bird house, the hole must be 1. easy to monitor, real resistant to tempestuous weather and predators. Search. Close get search box. Mounting: post or. ), you risk HOSP attacks and are enabling HOSP populations to explode. Designed by Steve Gilbertson of Aitkin MN, the Gilwood has since established itself as a favorite with both Bluebirders and the. Snooze boxes help manage bluebird populations that have declined per as much as 90%. Tip #3: Include vents at the top of your bluejay house. Depth of the compartment is 6-¾" width is 4". By spacing out feeding areas, using predator guards and removing access to nesting locations, you can deter sparrows from your bird feeders. Contents [ hide] Best Bluebird Feeder Reviews. Monitor your bird houses regularly to remove House Sparrow nests. 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. Bluebirds, chickadees, titmice, downy woodpeckers, and nuthatches can fit through a 1-1/2" diameter entrance, but this hole is too small for the larger sparrows and starlings to enter. Cut a 22-degree bevel across the top of the front section (A). 95 Add to Cart. Skip to topics. Complete you what up have success to bluebird houses! Includes PDF plans, DIY video tutorials & the HIGHEST pre-made nest boxes. People who successfully raise bluebirds (and other native secondary cavity nesters) in House Sparrow territory generally trap and euthanize House Sparrows that invade nestboxes, but this may be too late to save young or adult bluebirds from House Sparrow attack. Coveside Sparrow Resistant Bluebird House. Gilbertson PVC Box. There are guidelines provided and you can just follow these to be able to build a beautiful and effective Eastern Bluebird House. Sparrow-Resistant Eastern Bluebird House Regular price $59. The entry hole should be 1 9/16″ (optimum size) or 1 1/2″ in diameter. 125"W x 0. Triangle Bluebird House. Free bluebird house plans with video instruction. A ready-made, weather-resistant Sparrow Spooker is now commercially available from Sparrowtraps. Construction: pine. In this article, you’ll learn how to build or buy the right Sparrow bird house. To keep starlings out of a bird house, the hole must be 1. Cut the entry hole by drilling two overlapping holes with a 1-3/8- in. Your purchase directly supports Scenic Rivers Industries, a workshop that provides dignified employment for people with disabilities. Add to cart . 43) Modern Cardinal Birdhouse Plan. 42) CBRP Bluebirds House Plan. Skip to content. Bottom we must included free bluebird house plans, a simple one-board box that's relatively easy to build. The bluebird should have a house measuring about 5" in length and width, inside measurements, and 8" or more in depth. Latest Poles; ID Guides; BWHQ Recommends; Quizzes; Bluebird Houses: The Clear Guide (7 RELEASE Plans!)Free bluebird house plans with video instruction. Dimensions: 5. 25"L x 1. Skip to content. There are toe holds under the entrance inside. Note: This package contains 2 of the Sparrow-Resistant Cedar Eastern Bluebird Houses by Prime Retreat. Another one-board blackbird my plan is here (pdf). ID Guides; BWHQ Recommends; Quizzes; Bluebird Houses: To Definitive Guide (7 RELEASE Plans!). As if that is not enough, male sparrows will mate with several females. House sparrow questions, more. sjarrell / Getty Images Bluebirds are some of the most desirable cavity-nesting backyard birds, but they need a safe, attractive place to nest. Features slotted entrance to protect nestlings from House Sparrows. Ideal for:: Bluebird, Eastern Bluebird, Western Bluebird, Mountain Bluebird. Provide beautiful, musical bluebirds a secure roosting option by adding this handmade Sparrow-Resistant Cedar Eastern Bluebird House by Prime Retreat to your yard. Main; Final Posts; ID Guides; BWHQ Recommends; Quizzes; Menu. 4 cm) from both sides. Skip in content. that easy). Skip to satisfied. Select you need to have success with bluebird houses! Includes PDF plans, DIY video tutorials & the BEST pre-made nest fields. Sparrows are larger than bluebirds, so they won’t be able to fit through the entrance hole. 25"H. Sparrows dislike flying through these lines while bluebirds don’t seem to mind them. As we had a diverse array of board lengths, we first organized them into piles of similar size. #nativebirds #housesparrow #invasive #bluebirds #helpnatives. BirdSafe® Bluebird House & Pole with Noel Guard, a . I moved 3 of my 5 old bird houses I had far away in my yard hoping the Sparrows would continue to build nests in their new location. AN simple go build, yet proven bluebird house such is made mostly from one cedar house. We would like to thank the legions of NestWatchers who monitored 12,274 nest boxes (both guarded and unguarded), enabling this comparative study. Make a Bluebird Trail. The floor should be between 4 1/2 to 5 1/2 inches square and the floor should be 5 to 8 inches below the entry hole. 11 DIY Standing Desks. Generally, I post photo how-to's on. Search. 375"L x 1. One-board floor, Eastern Bluebird, Occident Bluebird and Mountain Bluebird plans. 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. Prior to installing the new nesting boxes, all but one box were taken over by house sparrows. Sparrow Resistant; BLUEBIRD HOUSE; WEATHERPROOF RECYCLED POLY; Bright. Many Bluebirders believe that the slotted entrance makes this house sparrow resistant. There are a lot of birdhouse plans that are species-specific for very good reasons. They will often kill baby birds and build their nest on top of the dead babies. . Home;. 70. 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. Bluebirds, cardinals, martins, etc. Boxes should be provided with drainage and ventilation spaces. For best results do not place house near trees or bushes, placing the house in the open will work best for Bluebirds. Free bluebird house plans with video instruction. Home;. See Bird House Hole Size if you want to attract a specific bird. ,. 125"H; 5. Features: Made from Western Red Cedar for light weight and durability. Kettle Moraine Cedar Bluebird Mealworm Feeder. This Kentucky style, slot entrance bluebird house is designed to thwart sparrows. Close this search box. To attach this piece, hammer nails through the front piece into the edges of the base and walls. • For Eastern Bluebirds, you can use a 1½ inch round hole, a 1⅜ x 2¼ inch vertical oval hole, or 1⅛ inch horizontal slot entrance. The best predator guard for a bluebird house or nest box that is commercially available is a stovepipe baffle at least 8 by 24 inches. It is better to have no nestbox than to have one that fledges House Sparrows. Bluebird House Plans. 2. 969 cm) entrance hole in the front piece. The plastic Bluebird House weighs but a pound, comes with a metal hanger that makes it very easy to install, features a robust rain guard, an interior ladder for chicks and adults, and is the driest, snuggest bluebird house on the market. 0, Sept 12, 2011Page 1 of 1 Front Ceiling Side Make 2 1 Left 1 Right 1-3/16" 6 3/4" 7 1/4" 3 1/8" 3 1/2" 11" 9 1/4" Roof Saw kerfs on roof underside 1/2" in from edge x 1/8" deep 14" Side View Front View Side Side Back Front Ceiling Floor Pivot Screws (each side. The plans can be used to attract either Westerly or Eastern Bluebirds. Steve Gilbertson uses the thinner-walled PVC because it is more flexible, and flexibility is what makes his. Bluebirds are fussy about their nest sites, and the size of the entrance hole is very important for attracting a nesting pair. 5 x 5 x 10 inches. 5″ hole 6″ off the floor. Don’t use cheap bird feed, like cracked corn, at your feeders. NESTBOX BAFFLES : A wobbling PVC baffle will deter many climbing mammals, but an 8" metal stovepipe baffle topped with hardware cloth will deter. 21) Andy’s Flicker House Plan. Begin a bluebird-specific trail in your field with this Coveside Sparrow-Resistant Bluebird Houses with Poles Package. The house sparrows begin nesting very early and often take open cavities first, while the starlings (although they nest later) are so much larger than bluebirds that they forcefully evict nesting bluebirds. Search. Although not fully Sparrow proof, it has been proven to have the least desirability to them when compared to any other nesting box designs. Step 2: Make an Entrance. House sparrow problems, view. Everything you need toward have success from bluebird hauser! Does PDF plans, DIY video tutorials & the BEST pre-made null boxes. Below we have included free bluebird house plans, a simple one-board box that's ratively easy to make. In the battle for nest boxes, understanding the habits and preferences of these two avian neighbors is essential. Everything you need to have success with bluebird houses! Includes PDF plans, DIY record tutorials & aforementioned BEST pre-made nest boxes. The bluebird pair have now constructed a new nest, and the mounting brackets for the spooker are installed and. Touch device users, explore by. 2-3/4 x 1-3/8 inch oval entry hole. 5” where the base of the floor is a 4. Sand all edges prior to assembly. Facebook-f Pinterest-p Youtube. Use a hole saw or jigsaw to create a clean, smooth entrance hole. Press two pushpins securely into the front of the nest box roof (about 1 3/4″ apart). The slotted entrance also enables bluebirds to escape more easily if threatened. If you are trying to attract bluebirds in an area where you suspect HouseGilbertson Bluebird House (Best “Sparrow-resistant” Bluebird House) Another popular style of nest box is the Gilbertson Bluebird House , which is made of thin PVC pipe. Putting Your Bluebird House Together. 22. Cracking the Cord of Wood Code: Understanding the Basics and Factors Affecting the Amount of Wood in a Cord. This house is very attractive to the Bluebird species as well as Wrens, and other small bird species. DutchCrafters Small Sparrow Resistant Bluebird Post Mount Poly Bird House - Choose Your Colors - Amish Made in America. Keep the threat of unwanted sparrows away from fantastic bluebirds with this Sparrow-Resistant Bluebird House with Open Top. 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 box You can then follow our general information and tips on making bird houses regarding placement, wood type and thickness, ventilation, predator prevention and more. Sparrows like to nest in trees and shrubs, so if you make it. Category: Home & Garden, Bird Feeders | Bird Houses, Backyard & Nature Products, Gift Ideas. A Nest-Box Plan for Western and Rock Bluebirds This is a fairly easy box to create. Made from Eastern white pine, which weathers beautifully to blend in with your backyard landscape. Mounting: pole or post mount. Once secure, attach the front piece to the side and bottom of the Bluebird house. This will allow the mylar strips to blow. 75"H each. How to Build a Bluebird House. bluebird houses can also have a 1 3/8 whatchamacallit 2 1/4 inch vertical oblong hole or a 1 1/8 inch horizontal sparrow-resistant slot entrance at the top front on and box . House sparrows will kill bluebirds and destroy eggs and young. Free bluebird house plans with video instruction. Encouraging territorial behavior is key to keeping sparrows away. Drainage holes can be created by cutting 1/2″ off each of the four corners of the bottom of the box and 1/2″ vent holes should be drilled/placed as shown. 5625 inch (3. 95. Facebook-f Pinterest-p Youtube. Insert the nail to hold the side door closed. Using a water proof siding material, like Hardie board siding, can also work in place of or on top of the roof. 99 USD Unit price / per . Wrens only need a 1-1/4" diameter entrance. 95 Sold Out Sold Out. Redbird Houses: The Definitive User (7 FREE Plans!)Build a Squirrel Proof Bird Feeder from Commonly Available Wood Material. 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. Unfortunately for nesting birds here in mid-TN there are a number of predators and pests that can deter, disrupt, or destroy an attempt to nest. Make those cuts (first cut should be on a 15-degree angle, the rest will be straight cuts). 25"H; Weight: 4 lbs. Drill 5/8" vent holes 1" down from the top and 2" in from each side. Approved by the North American Bluebird Society (NABS). 42) CBRP Bluebirds House Plan. containing millet and cracked corn. Modern Birdhouse Keeping house sparrows out of nest boxes is part of being a responsible bird landlord. For cavity-nesting birds, houses can provide the perfect place to build a nest and nurture. Although no nestbox suitable for bluebirds is sparrow-proof, some believe that House Sparrows are often comparatively more reluctant to use Gilbertson PVC boxes as well as other nestboxes that have a small interior volume. One-board plans, Easter Bluebird, Westie Bluebird and Mountain Bluebird plans. 00 / month. Vinyl-coated. Made in the USA, available exclusively at Duncraft. General information on how to attract nesting bluebirds, including distinguishing nests and eggs of other cavity nesters, heat, dealing with house sparrows, data on bluebird trail. Below are free diy PVC blue bird nest box plans that can be used to attract bluebirds, swallows, chickadees, nuthatches, warblers, woodpeckers, wrens, and other birds to your backyard or garden. These Audubon bluebird birdhouses are simple, well-built, and untreated. Woodlink NABB Audubon Bluebird Houses. NABS Fact Sheets & Plans. Eastern bluebird houses can also can a 1 3/8 x 2 1/4 inch vertical oval opening or a 1 1/8 inch horizontal sparrow-resistant slot entrance at who above cover of. Wrens only need a 1-1/4" diameter entrance. Eastern bluebird houses capacity also have a 1 3/8 x 2 1/4 inch vertical oval drill or a 1. House sparrow problems, more. Once the bluebird babies are 7 to 10 days old you can change the nest to keep it parasite free. House sparrows (click to learn more about the house sparrow predator), wrens, raccoons, snakes, crawling insects, flying insects, cats, mice, squirrels and the list can go on and on and on.