Fig. 1. Spectrograms of five snap sonations*. From top to bottom as labeled: three snaps (M. candei); two roll-snaps (nine and ten pulses respectively, from birds at different distances from recorder, M. candei); a click (P. mentalis); a rub-snap, showing the characteristic three sound pulses (P. mentalis); a full series of six claps, demonstrating the overall timing and pattern of claps (P. mentalis); two claps on an expanded time axis to show the relationship of the first and second pulses of sounds within each clap. Detailed descriptions of motions are given in the text. *Note variation in time-axis scale among spectrograms.

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