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Why Do Cats Purr?

posted by Melissa Breyer May 12, 2009 1:00 pm
Why Do Cats Purr?
48 comments

The phenomenon of purring has fascinated humans for ages. A lot of research has been conducted to figure out this feline mystique, but no one knows for certain why cats purr, though it is believed to be a voluntary act initiated by the central nervous system. In other words, cats purr on purpose, not just as an instinctive response.

Scientists report that cats produce purring sounds by using the diaphragm to push air back and forth across vibrating nerves in the larynx. Purring occurs in a frequency range between 25 and 150 hertz. At the lower end of the range, that rumbling sound can resemble an idling diesel engine, which has a similar velocity.

All domestic cats and most wild felids are are born with the ability to purr. Cats, from young kittens to senior citizens, purr when they are happy, such as when they are being petted, anticipating dinner, or snuggling on a warm, cozy bed. Mother cats purr when nursing their kittens, and kittens purr when nursing.

But many cats also purr when they are afraid or in pain. That helps explain why females may purr during labor and why some cats purr when they are being examined at a veterinary clinic or when they are recovering form an injury. The purring might serve to reassure or comfort the frightened cat, and some studies suggest that the low-level vibrations of purring physically stimulate feline muscles and bones to keep them healthy and actually hasten the healing process.

Excerpted from The Cat Behavior Answer Book (Storey, 2007), by Arden Moore.

More on Animal Communication (25 articles available)
More from Melissa Breyer (488 articles available)

48 comments

48 comments

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48 comments add your comment
Yolanda Chevalier

I took natural childbirth classes when I was pregnant with my first child, and one of the suggestions for during labor was to have soothing music or nature sounds. I decided to record my cat's purr. My kitty's purr is one of the most relaxing sounds for me. It always calms me and makes me feel better in times of stress. So, we recorded the purr and took the MP3 with us to the hospital and it did help calm me during labor. In fact it helped me so much, I use it on a regular basis to help me when I'm highly emotional to calm myself if my cat is busy eating or something and can't come purr for me. I have also found that having my cat at the head of my bed laying down purring while I stroke his furr also helps me go to sleep faster and easier. I feel totally content.

Anne L.
  • Anne L. says
  • Oct 30, 2009 10:34 PM

There is nothing more comforting and relaxing than a purring cat curled up on my lap. My beautiful cat, Linus, a gorgeous long-haired yellow tabby, who came to me from a farm barn, spends most of his time in my company when he isn't otherwise napping. He spends much time on my computer desk, on my lap, and sleeps with me every night, He is my best friend. I never let him outside. He is completely an indoor cat. I have owned cats all of my life, both in England and America. He communicates verbally with me. We really understand each other. He watches out for me if I feel under the weather, I love him so much.A purring cat to me is a sign of a happy and contented cat. Listening to them purr is very relaxing to me.

Mona G.
  • Mona G. says
  • Oct 30, 2009 10:24 AM

Thanks for this great article!! It seems like to purr is a kind of theraphy "calming" for cats,almost like I sing when i am terrifyed driving the high way sometimes.

Catherine O.

I've had cats all my life I just love them. Right now I have 2 long story short my calico is quiet & only purrs when she's being petted or asleep next to me.My other cat is very vocal lol I've always found that purring is a form of communication.If you listen to a baby sleeping they also make sounds.Cats have their own personalities & this is why I love to observe them.

Genevieve H.

Maybe like us humans moan when we are in pain, and in pleasure too. I have read somewhere that the moaning helps with bearing the pain when you suffer physically. The frequency of the moaning sound somehow seems to induce some sort of "drugged" state. So I have noticed in my own case. Too bad most people have been taught to grind their teeth and bear the pain in silence. Moaning is our natural way to cope with it. It's the human equivalent of purring. Maybe.

Ng F.
  • Ng F. says
  • Jul 8, 2009 8:40 PM

(3rd and last one)

... be calm, be brave, don't panic, never give up. Your kitty came to you for a reason. Enjoy every moment of her company.

Ng F.
  • Ng F. says
  • Jul 8, 2009 8:34 PM

(cont'd fr prev msg)

My 2nd cat had the same problem too when she first came, I changed her kibbles, and the problem was solved. And, for my case, I realized that my cat’s constant meowing wasn’t a cause for worry, but your case might be different. You might want to go to another vet for a 2nd opinion, or read up more on the net or fr books about cats.

Cats & dogs today, like humans, are having poorer and poorer immunity, with all the bad food we’re all taking and the terrible environment we all live in.

Nevertheless, don’t panic, cats can pick up your vibes, they respond to human behaviour more than you can imagine. Try communicating with your cat, strangely sometimes they do understand. Communication goes beyond human language. Whatever the case, being calm helps you fight any battle better.

I don’t’ know how things are like where you live, but I hope that whatever problems you might have with your cat, never give up on her, you’re her only companion. Take it as a chance for you to grow with her.

My cats have passed away, it was extremely tough when they were sick and leaving, but they have taught me SOOOO much. To them, I feel only gratitude, that they had given me the chance to learn so much, about taking care of another being, for showing me what love is. Actually, gratitude, as well as guilt, for not having done enough. What I want to put through to you is, whether the path ahead with your cat is easy or tough, be

Ng F.
  • Ng F. says
  • Jul 8, 2009 8:31 PM

Hi Elvira A,

I hope your kitty is doing better now.

Don't be too alarmed about cat behaviour. When my first cat came, I didn't know what to expect either. She was very docile and 'good mannered' when I picked her up from the SPCA, but a couple of days after I took her home, she became wild. I was shocked, and frightened, I didn't know what to make of it all, I thought my docile cat had turned into a crazy cat all of a sudden. That was my first pet, in fact the first time I got so close to an animal. But soon I realized that she was displaying those mischievous traits because she was starting to settle down, happily. And as a kitten, it was normal for her to dash about and attack my feet and slippers. She was literally playing ninja with me, either hiding and giving me the ambush, or dashing in lightning speed from the kitchen door to the living room window. The scare soon turned into great fun for me.

She meowed a lot too, which caused me a lot of worry. But after a while, I accepted that she was a talkative cat, that's all. It's the same as humans, some like to talk, some don't. In fact, I preferred it that both my cats were talkative. They’d respond to my calls, and when I looked at them, they’d look at me and give me periodic meows too.

Of course, do be vigilant, if your cat has persistent diarrhea, it could be simply just a passing phenomenon since she's trying to settle down in a new environment, or it could be an underlying medical condition.

Vural K.


Kabin
Konteyner

Charmaine Gonzalez

I have recorded my cats' sounds - including the purrs - in my cellphone and MP4 - something cudly about them.

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