With the help of citizen scientists, researchers have tracked how one rare sparrow song went ''viral'' across Canada, traveling over 3,000 kilometers between 2000 and 2019 and wiping out a historic song ending. The study reports that white-throated sparrows from British Columbia to Ontario have ditched their traditional three-note-ending song in favor of a unique two-note-ending variant -- although researchers don't know what made the new song so compelling.
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