アメリカ自然史博物館のインスタグラム(amnh) - 1月18日 12時50分

Hoo is this? Meet the Boreal Owl (Aegolius funereus)! This small nocturnal bird has asymmetrical ear openings: the right ear is much higher than the left! A sound coming from the ground will arrive at each ear at a slightly different time and intensity. By comparing the sound in each ear, the owl can pinpoint the location of small rodents such as voles—even when it’s too dark to see.🦉
Photo: MikoFox ⌘ Photography, CC BY-NC-SA 2.0, flickr

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