I don't know the answer, but can recommend the piece by Sarah Zhang in the Atlantic Monthly, with recordings and sonograms https://www.theatlantic.com/science/archive/2020/07/bird-song-sparrows/613768/
On Saturday, July 4, 2020 at 6:59:33 PM UTC-6, Willem van Vliet wrote: > > > A study, just published, shows the progressive eastward adoption of a > doublet-ending song among white-throated sparrows, replacing the > traditional triplet ending. The researchers found that birds from > different dialect groups overwinter together and suggest song tutoring > during this time is a facilitating factor ( > https://www.cell.com/current-biology/pdf/S0960-9822(20)30771-5.pdf?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982220307715%3Fshowall%3Dtrue > ). > > Is there any information on how white-throated sparrows in Colorado fit > into this trend? > > Willem van Vliet-- > Boulder County > -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/636fb675-8b48-45ac-9721-7bace1e92d77o%40googlegroups.com.
