Fig. 5

Sketches representative of different songs recorded northwest of Svalbard from October 2022 to April 2023. X-axes indicate time from 0 to 600 s, y-axes indicate frequency from 0 to 2500 Hz. Distinct variations in unit structure and arrangement were observed for songs 1, 3, 4, and 5. Song 1 and 3 contained irregularly occurring units (brown).