Boreal Owls are highly adapted to hunt in long hours of winter darkness. Uniquely, one ear opening in the skull is set high and the other much lower, an asymmetry that helps to pinpoint the sound of tiny rodents under the snow. They also have a pronounced disk of feathers encircling their faces that funnels sound to the ears. The staccato notes of the male’s song can carry for more than a mile on spring nights.

More info and transcript at BirdNote.org. 

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