Northern Hawk Owl - Surnia ulula

Song: The advertising call is a high-pitched tremolo, 3-5 seconds in duration, similar to the tremolo call of an Eastern Screech Owl. The alarm call is an ascending "screee-yip" of 2-3 seconds duration with emphasis on the last syllable.

Sound: John Neville (Bird Songs Western Boreal Forest); Canada, Alberta; Peace River Valley; Adult; Primary Sound;