Here are the results. The Bluebird entrance hole diameter is 15 inches the Nuthatch portal protector opening is 125 1 14 inches the Chickadee portal opening is 1125 1 18 inches and the Wren portal opening is 1 inch.
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These holes should be set at 15-inches from the bottom and 2-inches in from both the front and back.

1 inch bird house hole. 13022019 The slots were made by cutting two holes using the appropriate diameter hole saw then carefully filing out the space between these holes. 1 18-inch 2-9 cm diameter stops entry. Protect baby birds from predators.
This video shows how to enlarge an hole made by either a hole saw or a core drill this is useful if you need to enlarge an existing hole or if your original. 42 rows Entrance Hole The entrance hole should be large enough to admit the bird but not so large as to admit unwanted species. Easy to open easy to clean.
To attract the species you desire you will need to construct your bird house with specific sizes for the box itself entrance holes and the species desired height placement above ground. Each comes with 4 small screws for easy attachment. 125 32cm 6 15cm 5-15 2-5m Flicker.
This hole should be set at 58-inch from the top and 1 18-inch from the front. 03032014 One hole at the top front corner to attach the top brace. Using the correct bird house dimensions will also help to exclude undesirable species ie.
The outer dimensions of all are 2x 2. 1 or more open sides. Size for chickadees titmice and wrens Please note that in certain photos these hole protectors might appear to have an oval opening but the opening is definitely round.
Nuthatches prefer 1 14-inch to 1 38-inch diameter openings. CEDAR ALPHA Premium Cedar Wooden Beach Hut Bluebird House Bird House for Outside Vintage Style Stainless Steel Entrance Hole Protector Colorful Garden Decorative Cream Yellow 50 out of 5 stars. 4 Pieces Metal Bird House Guard with Copper Portal Bird House Replacement for Eastern Bluebird Houses 1 14 Inch Inner Diameter 46 out of 5 stars.
Diameter is a common size of entrance hole. Entrance Height Mounting Height. The sad reality is that since house sparrows are smaller than bluebirds sparrows cannot easily be deterred from using a bluebird house based on the entrance hole size alone.
Crows starlings blue jays and other possible predators such as cats and raccoons cant get through or reach past the narrow opening. 15 38 cm 6 15cm 4-6 1-2m Chickadee. 08022015 Bird Hole diameter inches Hole placement inches above floor Floor size inches Sides inches Feet above ground.
A very tiny hole will exclude all cavity-nesting bird species while a very a large hole is a welcome invitation to squirrels rats large snakes raccoons opossums or other animals to use the house instead of birds. About 7 8 diameter 12 tall and has a 15 hole. 25052021 A fraction of an inch too large and you may find less desirable birds such as house sparrows and European starlings usurping the birdhouse or killing other birds or nestlings.
175 45cm 6 15cm 10-15 3-5m Kestrel. Gourd Birdhouse medium 1-12 hole saddle tan For some wrens titmouses nuthatches and more. 3 76cm 9 23cm.
It has a 1 12 inch hole. This simple nesting box is made of heavy duty 34. 15032020 If a house entrance hole grows just 18 or 14 of an inch different species such as the house sparrow or European starling can get inside and may evict injure or even kill nesting or brooding birds.
Install a guardian tube in any 1-14 to 1-12 inch house entry hole. Any circular entrance hole that is 1 14 inches or smaller will be effective at keeping out house sparrows. The chickadee prefers 1 18-inch diameter openings the titmouse Bewicks wren and the downy woodpecker look for homes with 1 14-inch diameter openings.
Similarly predators such as cats and raccoons can more easily reach through larger holes. Unfortunately this size will also keep bluebirds from using the same nest box. Many wild birds prefer entrance holes that range between 1 and 1 12 inches in diameter.
HORIZONTAL SLOT 1 12-inch by I inch 38x25 cm slot still allows entry. However it is an advantageous to use a smaller size if you are planning to attract chickadees and wrens specifically. Besides bluebirds it is suitable for any songbird that uses a house such as chickadees titmice Carolina Wrens or Nuthatches.
25 635cm 4 10cm 6-10 2-3m House Finch. Tail support promotes easy entry for qualified entrants. 1 or more open sides.
2 51cm 4 10cm 5-10 2-3m House Sparrow. 07042021 Smooth chrome coated steel plates with screws included protect holes from being enlarged by squirrels and large birds. Two holes near the bottom to attach the bottom piece.
ROUND 1 14-inch 32 cm diameter still allows entry. If you want to attract smaller songbirds a 1.
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