The PMCA's Deluxe Universal House Sparrow Insert Trap is a highly efficient device for capturing these non-protected, harmful birds.
When placed and operated properly, it can capture many House Sparrows or even European Starlings during the cavity-hunting stages of these birds' nesting cycles. Works best for crescent entrances.
This insert trap will fit inside a wide variety of martin housing:
It will fit in other houses with it's dimensions of: 4-5/8" wide x 4-3/8" tall x 5-1/4" deep, with the entrance holes aligned (2- 5/16" entrance).
Works on wooden houses with round, oval, and crescent shaped entrances (may not work in excluder entrances in smaller cavities).