Movie S1.

Example of a prey removal in the laboratory with a trawling Myotis daubentonii. The bat exhibits full capture and echolocation behavior, although the worm is removed early (230 ms) before expected capture. The removal of the worm often created water ripples, which may add to the high variability in acoustic and behavioral reactions in trawling trials. Notably, this trial illustrates that with prey removals, the bats often looked into the tail membrane a second time, seemingly puzzled by the missing catch. The high-speed video was recorded at 300 frames per second and slowed 10 times for playback.