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The mechanism by which cats purr is elusive. This is partly because the cat has no unique anatomical feature that is clearly responsible for the sound.[2]One hypothesis, backed by electromyographic studies, is that cats produce the purring noise by using the vocal folds and/or the muscles of the larynx to alternately dilate and constrict the glottis rapidly, causing air vibrations during inhalation and exhalation.[3] Combined with the steady inhalation and exhalation of air as the cat breathes, a purring noise is produced with strong harmonics.[4] Purring is sometimes accompanied by other sounds, though this varies from cat to cat; in the audio samples that accompany this article, the first cat is only purring, while the vocal production of the second cat contains low level outbursts sometimes characterized as "lurps" or "yowps".