Figure 5. Spectrograms of low-frequency calls of leopard seal vocalizations. (A) Low double trill, (B) hoot with single trill, (C) descending trill and, (D) triple ascending trill (48,000 fast Fourier transform points and 4,800-point Hanning window).
Table 1. Acoustic characteristics of leopard seal vocalizations extracted from sample calls and call counts detected during acoustic measurements (n: the number of call samples, acoustic characteristics: mean±standard deviation, call counts\(\pm\)uncerntainty).