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(A) Swamp sparrow, M. georgiana. Photo courtesy of Rob Lachlan (Queen Mary University of London, London, UK). (B) The birds group intermediate notes with short notes and distinguish them from long notes when they occur at the beginning of the syllable, whereas they group them with long notes when they occur at the end of the syllable. Swamp sparrow songs typically consist of multiple repetitions of a given syllable.
