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
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