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Why Do Cats Love to Knead?

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If you're a cat lover, chances are your favorite feline has shown a penchant for kneading, and at some point has given you and/or a favorite piece of furniture a massage with his or her rhythmic paws. Colloquially called “making biscuits,” kneading is a common behavior among kittens and adult cats alike—but animal experts still aren't sure exactly why they do it.

Scientists have a few theories, some of which SciShow’s Hank Green outlined in this fascinating video. One theory is that your cat's kneading is an attempt to mark its territory—yes, even if that “territory” is you—with the scent glands in its paws. Another rationale is that kneading is a neotenic behavior, or a juvenile trait that sticks with cats into adulthood. Kittens knead their mother's belly to stimulate milk production—an act that’s nearly identical to that strange, Shiatsu-like practice it’s doing in your lap. (This could also explain why some adult cats also "suckle" the items they're kneading.)

Green does point out that domestic cats knead, whereas wild cats don’t, which raises the question: Why have only domestic felines retained this behavior? Green attributes this to the fact that house cats were selected over thousands of years for their friendlier, less aggressive traits, but says they've "probably also held on to some of their more social, baby-like behavior, just because it serves them well when they’re around people."

"I don’t know if you’ve heard this, but wildcats are not super social," Green jokes. "They don’t come up and cuddle, so much as try to eat your flesh. Felis silvestris, the ancestor of all domestic cats, is a solitary hunter that only socializes with members of its own species when it’s time to breed. So wildcats only developed social behaviors for two situations”—mating and caretaking behaviors between mother cats and their kittens.

“Unlike wild cats though, domesticated cats have a lot of social behaviors as adults, because they’re not wild loners anymore," Green adds. "They have us to cuddle with, con treats out of, and demand food from. So their innate tendencies for snuggling with mom and hitting on the lady cats are put to good use on us."

While occasionally painful or bothersome, kneading one’s owner is definitely a loving act on the part of the cat, a way of letting you know that it feels comfortable and safe with you. That said, don't sweat it if your cat isn’t big on the habit—or, conversely, worry that it kneads too much.

“Some cats are more needy and knead more than others,” Dr. Michael W. Fox, a veterinarian and author of the syndicated newspaper column "Animal Doctor,” advised one anxious reader who reported that her kitty had taken to kneading the family dog. “This behavior is exacerbated when a cat is weaned from its mother too soon. It’s an anxious cat’s way of seeking contact comfort.”

If you’re not a fan of kneading, it's futile to train your cat to cease a perfectly natural behavior. Instead, consider investing in a pair of nail clippers—and when you’ve finally had enough, gently push the cat away and enjoy the fleeting freedom of an empty lap.

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Big Questions
What Are Curlers Yelling About?
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WANG ZHAO/AFP/Getty Images

Curling is a sport that prides itself on civility—in fact, one of its key tenets is known as the “Spirit of Curling,” a term that illustrates the respect that the athletes have for both their own teammates and their opponents. But if you’re one of the millions of people who get absorbed by the sport once every four years, you probably noticed one quirk that is decidedly uncivilized: the yelling.

Watch any curling match and you’ll hear skips—or captains—on both sides barking and shouting as the 42-pound stone rumbles down the ice. This isn’t trash talk; it’s strategy. And, of course, curlers have their own jargon, so while their screams won’t make a whole lot of sense to the uninitiated, they could decide whether or not a team will have a spot on the podium once these Olympics are over.

For instance, when you hear a skip shouting “Whoa!” it means he or she needs their teammates to stop sweeping. Shouting “Hard!” means the others need to start sweeping faster. If that’s still not getting the job done, yelling “Hurry hard!” will likely drive the point home: pick up the intensity and sweep with downward pressure. A "Clean!" yell means put a brush on the ice but apply no pressure. This will clear the ice so the stone can glide more easily.

There's no regulation for the shouts, though—curler Erika Brown says she shouts “Right off!” and “Whoa!” to get her teammates to stop sweeping. And when it's time for the team to start sweeping, you might hear "Yes!" or "Sweep!" or "Get on it!" The actual terminology isn't as important as how the phrase is shouted. Curling is a sport predicated on feel, and it’s often the volume and urgency in the skip’s voice (and what shade of red they’re turning) that’s the most important aspect of the shouting.

If you need any more reason to make curling your favorite winter sport, once all that yelling is over and a winner is declared, it's not uncommon for both teams to go out for a round of drinks afterwards (with the winners picking up the tab, obviously). Find out how you can pick up a brush and learn the ins and outs of curling with our beginner's guide.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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Why You Should Never Take Your Shoes Off On an Airplane
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What should be worn during takeoff?

Tony Luna:

If you are a frequent flyer, you may often notice that some passengers like to kick off their shoes the moment they've settled down into their seats.

As an ex-flight attendant, I'm here to tell you that it is a dangerous thing to do. Why?

Besides stinking up the whole cabin, footwear is essential during an airplane emergency, even though it is not part of the flight safety information.

During an emergency, all sorts of debris and unpleasant ground surfaces will block your way toward the exit, as well as outside the aircraft. If your feet aren't properly covered, you'll have a hard time making your way to safety.

Imagine destroying your bare feet as you run down the aisle covered with broken glass, fires, and metal shards. Kind of like John McClane in Die Hard, but worse. Ouch!

Bruce Willis stars in 'Die Hard' (1988)
20th Century Fox Home Entertainment

A mere couple of seconds delay during an emergency evacuation can be a matter of life and death, especially in an enclosed environment. Not to mention the entire aircraft will likely be engulfed in panic and chaos.

So, the next time you go on a plane trip, please keep your shoes on during takeoff, even if it is uncomfortable.

You can slip on a pair of bathroom slippers if you really need to let your toes breathe. They're pretty useless in a real emergency evacuation, but at least they're better than going barefoot.

This post originally appeared on Quora. Click here to view.

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