Fig. 2. Flight patterns for three different behaviors (A–C), along with the corresponding spectrograms of the sounds produced by the bats (D–F). (A,D) A bat flew through the hole. (B,E) A bat inspected the hole. (C,F) A bat crashed into the net next to the landmark, at the usual position of the hole relative to the landmark. (A–C) The bats' flight paths are displayed as viewed from above. The net is indicated by a diagonal line and the opening is marked in pink. The pink triangle represents the landmark's position along the net in the specific trial. Blue circles denote the bat's position at the time of vocalization and black arrows indicate flight direction. (D–F) In the spectrograms, some of the pulses are clustered together in sound groups with two or three pulses (bracketed). A vertical red line in the spectrogram shows the time the bat flew through the hole, crashed into the net or started an inspection.