Fig. 1. Seismic signals of courting male jumping spiders. (A) Sonogram of a seismic signal. (B) Oscillogram of seismic signals. Courtship can be divided into four distinct phases, with seismic signals occurring in phases 2-4. (C) Detail of oscillogram marked by the box in B. All three types of seismic signals can be observed: thumps [Th (red)], buzzes [Bz (green)] and scrapes [Sc (blue)]. Individual scrapes occur in groups consisting of multiple repeated scrapes [Sc G (yellow)]. Recordings made using a laser Doppler vibrometer.