Six records from one male were examined. The calling song consists of phrases (Figure 3B) with irregular intervals. Phrase durations vary between 1.69 and 2.31 s (1.94 ± 0.13), and each phrase contains 71–82 syllables (74.6 ± 2.9). The phrase starts with 7–10 lower amplitudes syllables (generally corresponds to 1/7–1/8 of phrase) and continues with a crescending sequence and reach as highest amplitude at the end of this part (Figure 3C). The remaining syllables have quite similar amplitude. The phrase begins with an isolated first hemisyl- lable and is followed by a gap which last 27–58 ms (41.15 ± 9.97) between the first hemisyllable and the ordinary syllables in phrase. Oscillographic analyses show that the syllable periods duration varies between 20.44 and 31.81 ms (24.67 ± 1.6), and each syllable shows a standard structure, which is formulated as loud and long opening hemi- syllable + less loud and short closing hemisyllable (Figure 3D). The opening hemisyllables duration varies between 7.82–17.78 ms (13.45 ± 1.28), whereas the closing hemisyllable lasts for 8.73–15.90 ms (11.22 ± 1.09). [1]
