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== == A cat's purr is caused by the vibration of the cats vocal cords. When air is taken into the lungs, it passes through the voice box, which contains the vocal cords. Purring is obviously under control of the cat and they can purr at will, to show contentment. When the cat chooses to show their contented state, the vocal cords are allowed to vibrate as air is passed in and out of the lungs as the cat breathes. When the cat is sleeping, or not in the mood to purr, the passage of air does not affect the vocal cords and no purring sound is produced. == ==

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17y ago

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