Fig. 7. Spectrograms of six non-snap sonations*. From top to bottom as labeled: a snap and subsequent twelve-pulsed snort (M. manacus); three multi-pulsed rattles (M. aurantiacus); a sample of whirring (M. manacus); a sample of fanning (M. manacus); four humm pulses (P. mentalis); the extremely low-frequency swoop (P. mentalis). Detailed descriptions of motions are given in text. *Note variation in time-axis scale among spectrograms.