Movie 2.

Vibration maps (top) as a function of vibration frequency (moving vertical line in bottom graphs) of the right and left wing (left and right side, respectively) of a P. gorochovi male as recorded with LDV. The right wing shows highly damped, low-amplitude and irregular vibration velocity peaks throughout the frequency range (lower left graph) which correspond to irregular, low-amplitude vibration mode shapes mostly located outside the harp area, around the edges of the wing. Clear harp-based vibrations are exhibited towards higher frequencies only (upper left vibration maps). In contrast, the acoustically active left wing exhibits clearly delineated, higher-amplitude vibratory mode shapes located mostly within the harp (upper right) that correspond to pronounced high amplitude resonance peaks visible in the vibration velocity spectrum (lower right). Vibration velocities in maps are normalised for each frequency with dark red depicting the highest velocities; dark blue signifies no motion. See also Fig. 3.