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Sonograms of natural magpie-lark songs: (a) antiphonal duet, (b) sequential duet, (c) solo song, (d) sequential pseudo-duet, and (e) antiphonal pseudo-duet. Individual contributions are denoted with black and grey bars. All song types can be produced and initiated by both sexes, with 48% and 52% of pseudo-duets given by females and males, respectively (Results section).
