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I see why we have two eyes and two ears – but why two nostrils? Part 2

More expert comment from our readers on this one, with additional answers looking into how we have a dominant nostril, as well as considering the question from an evolutionary perspective

7 May 2025

Male nose close up bottom view - hair in the nostrils; Shutterstock ID 1895123341; purchase_order: -; job: -; client: -; other: -

Shutterstock/VanoVasaio

Last Word is Âé¶¹´«Ã½â€™s long-running series in which readers give scientific answers to each other’s questions, ranging from the minutiae of everyday life to absurd astronomical hypotheticals. To answer a question or ask a new one, email lastword@newscientist.com

Binocular vision gives us a 3D perspective, and two ears let us locate the direction of a sound. But why two nostrils? (continued)

Matthew Ravosa
Johns Hopkins University School of Medicine, Baltimore, Maryland, US

There are several reasons why two nostrils or “nares” are beneficial in terrestrial vertebrates. In contrast to fish, where the nostrils open to sensory…

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