Figure 1
From: The progression pattern of male hyrax songs and the role of climactic ending

(a) Proposed musical notation of male song corresponding to the parts represented in the spectrogram. (b) Sample spectrogram of male rock hyrax song. Different vocal elements are marked and coded as W-Wail, C-Chuck and S-Snort. The representation order of singing bouts corresponds to natural temporal progression of a typical male hyrax song (beginning – low complexity, middle – low/intermediate complexity. end – high complexity). Vertical lines mark bout boundaries.