Garden Pests and Diseases: Eliminating House Sparrows an European Starlings, 0 by Stelco

Stelco wrote:
This is one method that may work for folks who have a lot of House Sparrows. By using regular Bluebird houses to attract (and trap) House Sparrows and mixing these in, you may be able to convince EABL or TRES to nest in one of these. They are easy to make out of four inch PVC (or similar material) and HOSP don't seem to like them. They are not as attractive to EABL or TRES, but I had both nest in this type of "box" this year. The entrance notch should be about 1 1/2" deep and 2" wide. A couple of long nails hold the cup on the wooden roof structure.