Fig. 3. Example of the changes in different bat vocalization parameters during an attack sequence from one trial. The shaded areas mark the beginning and end of the approach, buzz I and buzz II phases. In the approach phase, pulse repetition rate (PRR) is consistent, pulse durations are over 3 ms and the bandwidth of the echolocation vocalizations is broad (based on the beginning and end frequencies). In the buzz I phase, PRR increases and pulse duration decreases. In the buzz II phase, PRR is over 100 pulses s–1, pulse duration continues to decrease, the sweep rate increases and the bandwidth of the echolocation vocalizations narrow. In the beginning of the buzz II phase, the relative amplitude of the echolocation vocalizations increases (probably as a result of the bat approaching the microphone located near the mantis target), but the relative amplitude drops in the second half of the buzz II phase (approximately 100 ms before contact).
