Song: Aerial display song a high-pitched, peevish "kee-kee-kee-kee..." (about 2 notes per second) varying slightly in pitch and intensity. Alarm call of female directed at intruders near the nest, a loud, hollow "cuk-cuk-cuk-cuk".
Sound: John Neville (Bird Songs of the Arctic); Canada, Yukon; Richardson Mountains; Adult; Primary Sound;