Fig. 2. In low searching flight over the experimental area, all bats emitted short, downward-modulated echolocation signals. Representative calls for Myotis capaccinii (A), M. daubentonii (B) and M. dasycneme (C) are presented as sonagrams with the averaged power spectrum on the right and the oscillogram below. The artificial probe signal that we used for ensonification (D, measured 1 m from the speaker) was designed to be similar to the signals used by the bats.