A variation on the white-throated sparrow’s song spread 3,300 kilometers in just a few decades
Some North American birds are changing their tune.
The traditional song of the white-throated sparrow (Zonotrichia albicollis) ends with a repeated triplet of notes. By 2000, however, some birds in western Canada were whistling a variation ending in a two-note pattern. That new song has since spread widely across North America, researchers report online July 2 in Current Biology.
https://www.sciencenews.org/article/white-throated-sparrow-song-variation
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