Why do cats purr?

Why do cats purr? It’s one of the most popular questions about cats. And it’s obvious why: purring is typical cat behavior. If there’s one thing we humans can’t do, then it’s producing this low rattling hum. And humans want to understand everything they can’t do themselves.

Purring starts in kittenhood. Most cats never stop doing it.

Not only domestic cats have made a habit of purring. In fact, the red lynx is the only cat that does not purr. All other felines make this sound - and they are the only animal family around that does.

Still there are differences. Wild felines purr only while breathing out, tame cats while breathing in and out.

There are cats that purr almost the whole day, others purr seldom. Why is not convincingly explained, but many social cats tend to purr more.

Not only ‘why do cats purr?’ is an often heard question, but how they do it, is equally popular.

Most zoologists believe purring is the vibration of two folds of membrane behind the vocal chords.

However, other experts believe it’s the result of turbulence in the vein that returns blood to the heart from the body.

Unfortunately there's no proof which theory is true. So let's get back to the main question:

Why do cats purr?

Experts agree that a purring cat shows contentment and happiness. But it can also be a request for human attention. It is known that ill cats and felines in pain often purr.

Most pregnant cats purr loudly when birth is imminent and continue to do so while giving birth. That makes zoologists think purring is a sign of stress as well. Maybe cats also purr to make a relaxing, self-comforting sound in hard times. That would be really clever!

Wonderful theories, but ... no proof. So next time someone asks you ‘Why do cats purr?’, you should answer: ‘Only the cat knows!’

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