Totally, 13 records from three males were examined. The calling song consists of phrases (Figure 5B) with irregular intervals. Phrase durations vary between 0.58 and 1.16 s (1.00 ± 0.09), and each phrase contains 22–55 syllables (45.25 ± 4.16). The phrase generally begins with low amplitude first syllable, which is shorter than the ordinary syllables and lasts for 10.9–18.5 ms (13.84 ± 2.17). The phrase starts with 4–10 lower amplitudes syllables (generally corresponding to 1/4) and continues with a crescending sequence and reaches for the highest amplitude at the end of this part. The remaining syllables have quite similar amplitude (Figure 5C). The oscillographic analyses show that the ordinary syllable periods duration varies between 10.9 and 45.91 ms (21.71 ± 2.34), and each ordinary syllable shows a standard structure which is formulated as soft opening hemisyllable + loud closing hemisyllable (Figure 5D). The phrase ends with last hemisyllable, which has a longer duration than the previous syllables in phrase and its duration varies between 22.96–45.91 ms (31.17 ± 4.51). [1]
