Fig. 1

To look at the relative importance of harmonic convergence and body size we recorded interactions between live pairs of different body sizes. We examined direct effects of body size on copula formation (Solid Line a) and also whether body size indirectly affected the probability of copula formation by increasing harmonic convergence incidence (Dashed Lines b). Finally, we measured the direct effect of harmonic convergence on copula formation (Solid Line 4). To assess the effect of body size on harmonic convergence (Solid Line, c) we used playback experiments