consider buying or building a wren birdhouse. These nest boxes are small and frequently made of wood, with an opening hole between 1 in. and 1-1/8 in. diameter. Measurements may vary slightly ...

The nest is not just a simple cup nest. No, the marsh wren male constructs a nest with a full dome over the top and an entrance on the side. The entire nest is ball-shaped, about 12 inches tall ...