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I have found a good site for you. Go to www.purplemartin.org. They give you tips and dimensions. The hole should be a semicircular hole with the flat side on the bottom. The best way for you to get the dimensions is to see the web site. They have pictures.
That would be for chickadees and titmice. Too small for bluebirds.
Martin Hole was born in 1959.
The hole should be about 1 and 1/2 inches in diameter although an 1/8 of an inch or so smaller would not hurt as Starlings( an invasive species known to take over active Martin nests) are a little bigger around than Purple Martins. But if you want to eliminate ever having to worry about Starlings messing with your Martin's nest. Cut out what looks like a half of a circle. Shown on http://www.purplemartin.org/inst/InstSREH.html Although this does not stop them devilish sparrows, but it'll ease some of the pressure for your Martins. Good Luck!!! Joe
What size hole do you need for a birdhouse?The size hole doesn't need to be too large. Birds are very good at squeezing into those holes. You could just make one the size of your fingers when they make a hole/circle.
Great Question! Birds are very picky. Bird houses should have a hole in them the size for the bird to barely fit into. Small birds like very small bird houses with very small holes. Larger birds like bird houses which have medium size holes, but much room inside. Some birds, like the black martin like to have a long approach path to their house, so their bird house must be on a very tall pole high above everything or they will not use it. Some birds just take what they can get. If you have a bird feeder and you get mostly little birds, hang a couple little bird houses in a nearby tree. If you want larger birds put their larger house in your back yard, hanging many size houses or too many bird houses in one tree I have found tends to leave empty houses. Birds are very social, but they are not like people, they do not like overcrowded homes.
It means that the baby bird inside got out.
Start digging a hole.
martin has a pot hole
The House in the Hole in the Side of the Tree was created in 1973.
The 19th hole in golf is called the club house
A Woodpecker does