First nesting pair has disappeared, leaving behind one egg

HU-509888430

After installing our first bluebird box, we had our first pair of bluebirds show up in early March. They were very active for a long time, coming and going from the nest box. A few weeks ago, however, I noticed the female seemed to have disappeared. We saw the male, always away from the box, just a couple of additional times, and now he has disappeared as well. I finally got up the courage to peek inside the box. (I had never monitored before.) I saw what appeared to be a well-built nest and one egg left behind. I never saw any fledglings, although I suppose they could have fledged and left without our noticing them.


Any ideas as to what has happened? I'm quite disappointed. What do I do next? Remove the egg, now that weeks have passed since seeing either parent? Remove the nest?


Hoping for a healthy next box again soon! Thanks!


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