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Purring is most often associated with contentment or pleasure. Cats have also been found to purr under extreme stress.
If you have concerns about a cat that purrs excessively or not at all, make an appointment with your vet.

Purr - Wikipedia

en.wikipedia.org/wiki/Purr

A purr is a tonal fluttering sound made by some species of felids, and two species of genets. ... respiratory variation[edit]. Domestic cats purr at a frequency of 20 to 30 vibrations per second. .....

Why Do Cats Purr? It's Not Just Because They're Happy | WIRED

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.

Why Do Cats Purr? - Pet WebMD

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

Feb 18, 2015 ... Purring is the most common sound cats make. Yet we know less about it than meowing, chirping, chattering, hissing, and growling. Yes, cats ...

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 ...

Why do cats purr? - Purina

www.purina.com.au/cats/behaviour/purring

There is nothing better than a cat curled up on your lap, satisfied and happy, but have you ever wondered just how cats purr and why they do it? Humans smile ...

www.ask.com/youtube?q=Why do cats purr?&v=7KowU4tPi7Q
Apr 4, 2013 ... The smaller members of the felid family can purr, but why? Hank takes on this most adorable of life's mysteries in todays episode of SciShow.

Why Do Cats Purr? The Answer Might Not Be What You Think - Bustle

www.bustle.com/articles/127553-why-do-cats-purr-the-answer-might-not-be-what-you-think

Dec 3, 2015 ... Yet, beyond knowing it's amazing, you might not know exactly how or why cats purr — and it turns out there's a lot more to it than you might ...

Why do cats purr? - Scientific American

www.scientificamerican.com/article/why-do-cats-purr/

Jan 27, 2003 ... Most felid species produce a "purr-like" vocalization. In domestic cats, purring is most noticeable when an animal is nursing her kittens or when ...

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

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

Although some big cats like lions exhibit a purr-like sound, studies show that the ... Cat Guide provides information on many cat questions such as “Why do cats ...