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Number of songs given by males during eight treatments: sequential duet, pseudo-duet, monotypic (sequential) duet and solo, accompanied by one (w1) or two (w2) birds moving their wings. Numbers of songs given by males prior to playbacks (control) are indicated by dashed lines. Significant differences between songs with one and two moving birds are indicated with thick black lines (n = 12; Tukey HSD, *** p < 0.001, * p = 0.01–0.05). The boxes show mean ± s.e.m.
