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Purring appears to be produced by the laryngeal muscles rapidly opening and closing the glottis. Unlike other vocalizations, purring is produced during the entire respiratory cycle and is not limited to expiration of the breath.

en.wikipedia.org/wiki/Purr

It is neither continuous nor does it correspond to respiration, and thus is not a true purr. Problems playing these files? See media help. A purr is a tonal fluttering sound made by some species of felids, and two species of genets. ... Domestic cats purr at a frequency of 20 to 30 vibrations per second. Eklund, Peters & Duthie ...

pets.webmd.com/cats/why-do-cats-purr

Purring is the most common sound cats make. Yet we know less about it than meowing, chirping, chattering, hissing, and growling. Yes, cats purr when they're  ...

www.mnn.com/family/pets/stories/why-do-cats-purr

Jul 16, 2015 ... Have you ever wondered why cats purr? It's easy to assume that cats purr because they're content, but research shows that purring is a means ...

www.loc.gov/rr/scitech/mysteries/catspurr.html

No one knows for sure why a domestic cat purrs, but many people interpret the ... Cat Guide provides information on many cat questions such as “Why do cats ...

.ask.com/youtube?q=How+Do+Cats+Purr%3F&v=7_zKkBKu1fs
Mar 7, 2014 ... Cats purr for all kinds of reasons, including communication and healing themselves. Cristen explains how purring works and which cats can't ...

www.wired.com/2015/05/why-do-cats-purr

May 8, 2015 ... Why is your cat purring? He might be happy to see you, or hungry, or hurt...or he might just be trying to regenerate his bones.

animals.howstuffworks.com/pets/question394.htm

And so it is with cats purring. We cannot purr, so we are interested in how cats can do it. It turns out that domestic cats, some wild cats like pumas and mountain  ...

www.drsfostersmith.com/pic/article.cfm?articleid=892

Everyone loves a purring cat? But what is your cat trying to say? Find out now.

www.catbehaviorassociates.com/why-cats-purr

Sep 26, 2014 ... That gentle sound relaxes and even mystifies you, but just how much do you really know about why and how your cat purrs? Some facts may ...