Fig. 2. (A) Click train of an echolocation event with a search, approach and buzz phases. Arrow marks start of the approach phase, where the first echo is received by the tag. (B) Expanded version of one of the clicks in A, showing the emitted click and a returning prey echo. (C) Envelope of the cross-correlation of the waveform displayed in B. t marks the delay between the sounds and thereby the two-way-travel time (TWT).