Usually by mid-January, the local titmice and wrens are behaving as if it were already spring. They have begun nosing around for someone to court and somewhere private to suffer the consequences of courting. And I want to be welcoming.
So, a long time ago, long enough that I can't remember exactly when, I grew a gourd vine along the front of the house. With the help of my Zucchini Sex Goddess skills, the vine actually produced a dozen or so gourds. Most I gave away, but one got stashed in the attic. Not quite forgotten, but it really had no purpose.
Until now. Perfect for a wren house, right? I'm hoping so. A 1" hole for the entryway also made it easy to dump out the seeds and fibers remaining in the gourd. Two small holes at the top for hanging, and four 1/4" holes at the bottom for drainage completed the job. Except that of course I had to gussy it all up by staining the outside with a wood stain, and rubbing in glitter-gold highlights. Then four coats of polyurethane for sealing.
More complete instructions for making a birdhouse can be found here. You can buy gourds or grow your own gourds in Oakland, but most likely you will have to play Zucchini Sex Goddess or God yourself because of our foggy mornings.
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And for an informative and silly look at gourds and humans, a Tom A. Sterns made this video. Enjoy!