Song Sparrow singing © Jamie ChavezBETWEEN SHOVELFULS OF SNOW, a song. Not an alarm call, but a real bird song, up the path in range to catch my ear, but not so close that I could see the songster. How can that be, in February in the Northeast; don’t many, or even most, songbirds lose the ability to sing in winter?

Yes, said my friend Ellen Blackstone of the BirdNote public-radio program, who has been the tour guide for our ongoing series of bird stories here on the blog. (Browse all past installments.)

The part of the bird’s brain that’s used for singing shrinks to lighten the bird’s body mass in the offseason, she explained (and here’s the link to hear more on that). In fall and winter, there is no mating ritual; no need to stake out a territory.

Many birds can still sound alarm calls in the offseason (like the consistently loudmouth blue jay), but not sing.

Song Sparrow © PutneypicsBut then Ellen had an idea: “Maybe it was a song sparrow—what did it sound like?” she asked. The song sparrow, she explained, was a possible exception to the offseason songless norm. Research as far back as 1947 cites its potential for “dawn singing on clear, cold mornings in January and February.”

Ah, if only I could remember. You might recall: I’m not too good at birding by ear. No positive ID here, because I haven’t actually seen a song sparrow lately (just white-throated sparrows, along with these other birds this winter).

But be assured that I’ll be listening, and watching, on these brighter second-half-of-winter days.

more song sparrow facts, from birdnote

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FIND ANSWERS to other bird questions in the BirdNote show archives, or on their FieldNotes blog. All of my past interviews with BirdNote can be found at this link.

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The BirdNote backstory: In 2002, the then-executive director of Seattle Audubon heard a short public-radio show called StarDate. “We could do that with birds,” she thought. In 2005 the idea became a two-minute daily public-radio show. Lucky for all of us!

(Photos: sparrow on branch by Putneypics; sparrow singing by JamieChavez. Used with permission.)