This Ugly Little Animal Cannot Get Cancer, Feels No Pain, and Lives Forever. Meet the Naked Mole Rat
If you ever looked at a naked mole rat and thought, “What went wrong here?” you are not alone.
This animal looks like someone took a sausage, gave it four tiny legs, stuck two front teeth on it, and forgot to add skin. It has the face of a very old man who just saw something shocking.
Its body is loose, wrinkled, and pink. It has almost no hair. Its eyes are so small and useless that it basically uses them as decoration.
And yet, this ridiculous-looking creature might be one of the most extraordinary animals alive today.
No, seriously.
First, Let Us Get the Obvious Out of the Way
The naked mole rat is a small rodent that lives underground in East Africa, mostly in Kenya, Ethiopia, and Somalia.
It is not actually a mole. It is not actually a rat. It just has an unfortunate name that perfectly describes what it looks like.
It grows to about 3 to 4 inches long and weighs around 35 grams. To give you a sense of how small that is, a chicken egg weighs more.
It lives in large underground colonies of up to 300 individuals, and it barely ever sees sunlight. Given what it looks like, that might be a good thing for everyone involved.
It Is Cold-Blooded. Yes, a Mammal.
Here is where things start to get strange.
Almost every mammal on Earth is warm-blooded. That means their bodies regulate their own temperature from the inside, no matter what the weather is doing outside. You, your dog, your cat, the squirrel in your backyard, all warm-blooded.
Not the naked mole rat.
This animal is cold-blooded, just like a lizard or a snake. It cannot regulate its own body temperature.
So when it gets cold, it presses its body against other mole rats in the colony to steal their warmth. When it gets hot, it moves deeper underground where it is cooler.
Scientists call this behavior “thermoconforming.” The naked mole rat calls it Tuesday.
This makes it the only known mammal in the world that is functionally cold-blooded. Scientists did not see that coming.
It Cannot Feel Pain. Not Like You Think.
If you dropped acid on your skin (please do not do this), you would feel an intense, burning pain. That is your nervous system doing its job, telling you that something is very wrong.
The naked mole rat would feel nothing.
It lacks a specific chemical in its body called Substance P, which is responsible for sending pain signals to the brain. Pour acid on its skin, rub it with chili pepper, nothing. It just keeps walking around, unbothered, like the pain did not even try.
Scientists believe this ability developed because mole rats live in cramped underground tunnels where carbon dioxide builds up.
That much CO₂ would cause a burning sensation in most animals. The mole rat simply evolved to not care. It looked at pain, shrugged, and moved on.
Now for the Big One: It Cannot Get Cancer
This is the part that makes scientists put down their coffee and lean forward.
Naked mole rats do not get cancer.
Not rarely. Not occasionally. Not with exceptions. Researchers have studied these animals for decades, and in all that time, no one has found a naturally occurring case of cancer in a naked mole rat.
The reason appears to be a special sugar-like molecule in their bodies called hyaluronan. In most animals, including humans, this molecule exists in a regular form.
In naked mole rats, it exists in an unusually large, dense form that creates a kind of gooey barrier between cells. When cells start growing too close together, this barrier triggers a signal that tells them to stop.
Cancer, at its core, is cells that will not stop growing. The naked mole rat has a built-in biological bouncer that kicks those cells out before the party gets out of hand.
Researchers are studying this seriously. Not as a curiosity. As a potential path toward new cancer treatments for humans.
A wrinkled, blind, underground sausage might one day help save your life. Let that sit for a moment.
It Lives an Absurdly Long Time
A house mouse lives for about 2 to 3 years. A regular rat lives for maybe 4 years at most.
The naked mole rat lives for up to 30 years. Some have been recorded living past 37 years in captivity.
That is not a typo. For an animal its size, that is almost unbelievable. By the rules of biology, a creature that small should burn fast and die young. The naked mole rat did not get that memo.
What is even stranger is that it does not age the way other animals do.
In most creatures, the older they get, the higher their chance of dying in a given year. Scientists call this increased mortality risk with age. It is basically the biological guarantee that everything gets weaker over time.
In naked mole rats, that rule does not apply. Their risk of dying stays about the same whether they are 2 years old or 25. Scientists gave this a name: negligible senescence. Which is a fancy way of saying, “This animal somehow forgot how to age properly.”
It Has a Queen. A Literal Queen.
Naked mole rats are one of the only mammals in the world that live like ants or bees. They are eusocial, meaning the colony is built around one dominant female: the queen.
The queen is the only female in the colony that reproduces. She is larger than everyone else, more aggressive, and she runs the entire operation.
The other members of the colony are workers, soldiers, and helpers, all devoted to the queen and her pups.
When the queen dies, something remarkable happens. The females in the colony start fighting.
Eventually, one emerges as the new queen, and her body actually changes to prepare for reproduction. Her spine elongates so she can carry more pups. Her whole biology shifts.
It is like watching a corporate power struggle, except underground, and everyone is naked.
Its Teeth Can Move Independently
A naked mole rat’s front teeth sit outside of its lips. They stick out like tiny orange tusks, and the animal uses them to dig through hard soil. It can close its lips behind those teeth so it does not swallow dirt while digging.
But the truly strange part is that it can move each tooth independently, the way you might move your index finger and middle finger separately. This gives it an ability that looks, frankly, unsettling if you watch it up close.
It basically uses its teeth like chopsticks.
It Can Survive With Almost No Oxygen
Naked mole rat colonies run deep underground, and oxygen can get very, very low in those tunnels. For most animals, low oxygen means organ failure and death within minutes.
The naked mole rat just switches fuel.
When oxygen drops too low, its body stops running on glucose the way most mammals do and switches to fructose instead, using a metabolic pathway that does not require oxygen. It is a backup system that humans and most other mammals simply do not have.
Scientists tested this by putting naked mole rats in an environment with almost zero oxygen. The rats went limp, appeared unconscious, but did not die. When oxygen was restored, they got up and continued with their day like nothing happened.
So What Does All of This Mean?
The naked mole rat is, objectively, not a pretty animal. It looks like it was assembled in a hurry, from leftover parts, by someone who had never seen a mammal before.
But it is also cold-blooded, cancer-proof, pain-resistant, nearly immortal, capable of surviving without oxygen, and it lives in an underground monarchy.
It does not follow the rules that most mammals follow. It just does what works, deep underground, away from sunlight and the opinions of other animals.
And scientists around the world are studying it right now because what works for the naked mole rat might, one day, work for us too.
Sometimes the answer to big human problems is hiding in a small, wrinkled, mostly blind animal that looks like a thumb in distress.
Nature has a strange sense of humor.
