Look out for dive-bombing wrens if you get to close to the wren house in our yard! It is amazing how such small birds can be so aggressive in defending their space. They will take on much larger birds such as woodpeckers. I even saw the wren drive a squirrel away several times, sending it running across the street into the neighbor's yard.
We had one successful brood and now, another pair of wrens has a nest. Hopefully, we will hear the babies chattering soon.