A. Male calling song, field recording number 140723_11, oscillogram (above) and spectrogram (below), 10 s window, 25.4°C. PTR = 2.2 s-1, PTCF = 6.3 kHz; B. 1 s window of same recording as in A, expanded from region surrounded by red box, showing pulse structure; C. 10 s oscillogram of interaction between two males in the field, recording 140723_09, 23.9°C. Changes in PTR of focal male are indicated.