Fig. 1. Seismic transfer functions of natural substrates measured at 5 mm from source: rocks (A); desert sand (B); leaf litter (C). Mean (thick lines) and individual (thin lines) transfer functions are plotted. Boxes show the bandwidth of buzz (black), and thump and scrape (white) seismic signals produced by courting males. Red trace (A) shows transfer function of the rock used in behavioural trials. Inset (B) shows transfer function of desert sand at a different scale to show its band pass property. All dB are gain relative to the input signal.