Figure 4.

The number of songs given by males during (a) experiment 1 and (b) experiment 2. The treatments carried out in experiment 1 were: antiphonal duet (alternating male and female motifs), sequential duet (sequential male and female motifs) and solo (male or female solo song). The treatments for experiment 2 were: sequential duet, pseudo-duet (male or female solo song with two motif types played sequentially) and monotypic duet (male and female motifs of the same type played sequentially). Numbers of songs given before playbacks (control) are indicated with the dashed lines. Significant differences are indicated with thick black lines (n = 12; Tukey HSD, *** p < 0.001). The boxes show mean ± s.e.m.