[TN-Bird] Bluebird Houses

Our Bluebirds can enter a 1-1/4" hole, but it is tight; our House Sparrows 
cannot.
We use a house with a 1-7/16" hole, but if House Sparrows start entering, we 
bush (sorry for the political word!) it down to 1-1/4" until they leave.

I have read that an elliptical hole 1-1/2" wide and 1-1/4" high will admit 
Bluebirds comfortably and exclude House Sparrows.

David and Gloria Patterson
Chattanooga, Hamilton County, TN
April 30, 2005
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