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About the Cover
Cover: In Europe, three species of bat habitually hunt for insects at low levels above water, among them Daubenton's bat (Myotis daubentonii). They often glean prey from the water surface, a behaviour termed 'trawling'. These bats use downward frequency-modulated echolocation calls to detect and locate their prey on and above the smooth water surface (the inset shows a sonagram representation of a search call recorded in a flight tent). Smooth surfaces reflect little clutter echo back to the bat and therefore provide acoustic advantages for prey perception, as we have shown in behavioural and ensonification experiments (Siemers, Stilz and Schnitzler, pp. 3843-3854). Photograph courtesy of Dietmar Nill.
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