Walking past the sage-scrub open space in the pre-dawn winter twilight, I heard a number of birds singing loudly.  Some sounded like Song Sparrows improvising a different intro and jazzier closing notes—maybe a different song for winter than summer?  Others made me think of extremely musical Spotted Towhees, although Spotteds (and most songbirds) don’t sing…

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When I used to monitor nestboxes, I would listen carefully as I approached a box, trying to hear what birds were in the area.  One especially bubbly, bouncing song would alert me to potential problems for the other cavity nesters in the vicinity. A 21st-century “troglodyte”—a.k.a. a House Wren—was looking to set up housekeeping.  …

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