Spectrograms of introductory notes and songs of three species of Pseudocolopteryx: P. acutipennis, P. sclateri, and P. flaviventris (LNS 19536, 43674, 43909–10, and 51382–83). Arrows indicate introductory notes. For each species, several introductory notes are followed by the song body. Introductory notes of P. acutipennis and P. flaviventris are vocal, whereas those of P. sclateri are bill-snaps