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This undated handout image obtained July 2, 2020 shows the white-throated sparrow. In the 1950s, bird lovers in Canada easily recognized the song of the white-throated sparrow, a kind of Canadian sparrow, thanks to the three final notes of its song, repeated several times.Words even accompanied them: “Oh my sweet, Ca-na-da, Ca-na-da, Ca-na-da”. But at the end of the last century, biologists noticed that local birds were starting to innovate in western Canada: instead of the triplet ending, their song ended with a series of two notes, duolets, a little syncopated, as if the end had become: “Ca-na, Ca-na, Ca-na”. (Photo by Scott M. Ramsey/AFP Photo)
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