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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.

Why and how do cats purr?(Everyday Mysteries: Fun Science Facts ...

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

Why and how do cats purr? Answer: No one knows for sure why a domestic cat purrs, but many people interpret the sound as one of contentment.

How do cats purr? | HowStuffWorks

animals.howstuffworks.com/pets/question394.htm

Humans seem to be fascinated by animals who can do things that we cannot. For example, HowStuffWorks has answers to questions about camel humps, Hawk ...

How Do Cats Purr? | Mental Floss

mentalfloss.com/article/12312/how-do-cats-purr

Aug 23, 2012 ... Biologists used to think that purrs were the sound of blood surging through cats' inferior vena cava, the large vein that carries blood from the ...

How Do Cats Purr - LoveToKnow

cats.lovetoknow.com/How_Do_Cats_Purr

How do cats purr, you may wonder as you snuggle with your cat on the couch, when you notice her expressing her content with being by your side. Purring is ...

Why do cats purr? | MNN - Mother Nature Network

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 ...

How Do Cats Purr? - Live Science

www.livescience.com/32286-how-do-cats-purr.html

Nov 19, 2012 ... Scientists are still puzzled over the exact mechanism of how cats purr.

Why Do Cats Purr? - Catster

www.catster.com/cat-behavior/how-do-cats-purr

Dec 3, 2009 ... How Do Cats Purr? The physiological origin of the purr is also open to debate. It is not being generated exclusively by the vocal chords like a ...

Can Cats Purr in Their Sleep? - Petful

www.petful.com/behaviors/can-cats-purr-in-their-sleep/

Nov 8, 2013 ... How Do Cats Purr? Experts are still trying to determine how exactly it is that cats purr, but most agree that it originates in the brain. They think ...

How Do Cats Purr? - Life with Siamese Cats

www.life-with-siamese-cats.com/how-do-cats-purr.html

But it's a fair question, and one that's always fascinated me, too. I didn't really know, though, and he wasn't happy with that, so I promised to find out. The answer ...