FFacts On Tap Editorial Team Fact-checkedUpdated March 12, 20254 min read
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Naked mole rats look like little more than wrinkled, buck-toothed sausages, but underneath that odd exterior is one of the strangest mammals alive. Native to the arid grasslands of East Africa, they live almost their entire lives underground in colonies that behave more like beehives than typical rodent families.
From near-total pain insensitivity to a remarkable resistance to cancer, naked mole rats have become one of biology's favorite research subjects. Here are the verified facts behind their reputation.
Naked mole rats are eusocial, a social structure otherwise seen mainly in ants, bees, and termites, not other mammals.
In each colony, a single breeding female called the queen and one to three breeding males reproduce, while dozens of other mole rats work as diggers, foragers, or soldiers.
Naked mole rats can live more than 30 years in captivity, making them the longest-lived rodent known to science.
Their extreme longevity is linked to a very low metabolic rate and unusually effective cellular defenses against damage and cancer.
Naked mole rats produce an extra-high-molecular-weight form of hyaluronan, a substance that makes their cells hypersensitive to overcrowding and stops early tumors from forming.
Naked mole-rat skin lacks substance P, a neuropeptide most mammals need to signal certain kinds of pain, which is why they show little reaction to acid and to capsaicin, the compound that makes chili peppers burn.
They can still feel and react to sharp physical injury; what they lack is sensitivity to specific chemical pain signals like acid and capsaicin.
Naked mole rats are essentially cold-blooded for mammals: unlike almost all other mammals, their body temperature shifts with their burrow's temperature instead of being held constant internally.
They have only a few dozen fine hairs scattered across their bodies, which act like a cat's whiskers to help them feel their way through tunnels in total darkness.
They dig extensive tunnel systems, sometimes stretching several kilometers, using their oversized front teeth like a pair of shovels.
Their diet consists mainly of large underground tubers, and a single tuber can feed a colony for months since the plant survives being partially eaten.
Naked mole rats can tolerate air with as little as 5% oxygen for hours at a time, a level that would quickly kill most mammals.
They can survive roughly 18 minutes with essentially no oxygen at all by switching their brain and body to a fructose-based metabolism instead of relying on glucose.
This fructose-fueled metabolism is an adaptation to their crowded, poorly ventilated underground burrows, where carbon dioxide builds up and oxygen runs low.
Naked mole rats communicate using a range of distinct vocalizations, including chirps and grunts, and different colonies have been found to use their own dialects.
They are functionally blind, with tiny eyes that can only distinguish light from dark, and rely instead on touch, smell, and hearing to get around.
Frequently asked questions
How do naked mole rats see in the dark?
They barely do. Naked mole rats are functionally blind, with tiny eyes that can only tell light from dark, so they rely on touch, smell, and hearing to navigate their tunnels.
What makes naked mole rats socially unique among mammals?
They are eusocial, meaning a single breeding queen and a few breeding males reproduce for the whole colony while the rest work as diggers, foragers, or soldiers, a social system otherwise seen mainly in insects like ants and bees.
Why don't naked mole rats get cancer?
Their cells produce an unusually large, high-molecular-weight form of hyaluronan, a substance that makes cells extremely sensitive to overcrowding and stops abnormal cells from multiplying into tumors.
Can naked mole rats feel pain?
They can feel sharp physical injury, but they lack a chemical called substance P in their skin, so they show little to no reaction to acid pain or the burning sensation from capsaicin in chili peppers.
What do naked mole rats eat?
They feed mainly on large underground tubers, which can weigh many times more than the mole rats themselves and can regrow after being partially eaten, feeding a colony for extended periods.
How do naked mole rats survive in low-oxygen environments?
They can tolerate air with as little as 5% oxygen for hours and can survive about 18 minutes with virtually no oxygen at all by switching their metabolism to run on fructose instead of glucose.
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