Song: Extremely high-pitched (beyond the hearing range of some observers) "tsit-tsit-tsit-tsit-tsit-tsit-tsit", of variable speed. Staccato quality distinguishes it from Cape May, Bay-breasted, and Black-and-white Warblers. Also has a distinct rise then fall in volume.
Sound: Lang Elliott; 1989 Jun 22; USA, New York; Adult; Primary Sound;