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
Blue Bird House
The blue bird of paradise is a small bird native to Papua New Guinea. It is known for its stunning blue and black plumage and elaborate courtship display. The male has colorful plumes and a distinctive shield-shaped crest on its head.
It is a slang work for cop.
According to my bird's vet,Blu is a blue and gold macaw.
Blue Bird House
What about Blue Bird?
Yes, "Blue Jay" should be capitalized when referring to the bird species, just like other bird names are capitalized.
its just a bird which is blue
Blue Bird Mini Bird was created in 1977.
Blue Bird Micro Bird was created in 1975.
to see the blue bird, you must get the person you like to 8 hearts and the mayor to 3-4 hearts. a few says after, Hamilton will come to your house and tell you about the Blue Bird of Happiness and how it's feather is a traditional marriage proposal. anywhere between the next day and 2 weeks later, when you leave your house, you will see a blue bird. Then just follow the bird to Caramel Falls. They go around the path, past the waterfall; just as if you were about to go to the hot springs. Just keep walking and the scene will trigger when you are on the other side.
a blue jay or aka blue bird
yes a blue jay is a bird
There is a new word for blue bird.
If you have found someone you like and they are up to 8 hearts, the mayor will come to your house and tell you a story about the Blue Bird of Happiness. About a week from then, when you exit the house, you will get a scene where a blue bird is flying towards Caramel Falls. Go to Caramel Falls, and you will find a blue feather. Then, you can give it to whoever you want to marry.
blue bird is the international symbol of hsppiness