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 cobirds+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/636fb675-8b48-45ac-9721-7bace1e92d77o%40googlegroups.com.
