Song: Distinctive rising and falling winnowing "hoo-hoo-hoo-hoo-hoo..." produced by air passing through the tail feathers of males in display flight. Also, an excited "kik-kik-kik-kik" reminiscent of the laughing call of Northern Flicker.
Sound: Monty Brigham (Nature Sounds of Ontario); 1978 May 26; Canada, Ontario; Richmond; Adult; Call;