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: Henri Ouellet (Bird Sounds of Canada); 1983 Jun 6; Canada, Québec; Fort Chimo; Adult; Primary Sound;