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.