Some mole-rats actually farm their own food underground

Introduction: an unsuspected form of underground agriculture

A behavior that upends what we thought we knew

When we think of agriculture, we picture fields, tractors, and humans bent over the soil for roughly ten thousand years. Yet certain mole-rats have, for far longer, been practicing an active form of environmental management underground that looks remarkably like a genuine rudimentary agriculture. Researchers have observed that these rodents do not simply dig tunnels to find roots and tubers that happen to already be there: they tend, protect, and actively encourage the regrowth of these food reserves, year after year, generation after generation, in an ongoing cycle of upkeep.

This kind of discovery reminds me why I love covering natural science so much: we think we've known an animal for decades, and then a single patient observation completely overturns our understanding of its daily life.

This discovery, widely reported by National Geographic, adds to a very short list of animal species known to actively cultivate their own food. Until now, the most famous example remained the fungus-farming ants, capable of growing fungus in underground gardens for millions of years. Seeing a burrowing mammal join this exclusive club fundamentally changes how scientists think about the evolution of animal behavior and even the very definition of what counts as an agricultural practice.

Why the word agriculture isn't an overstatement

The word agriculture might seem like a stretch to describe the behavior of a small, blind, burrowing rodent. Yet the scientific criteria that define an agricultural practice largely hold up here: active management of a plant resource, repeated maintenance over time, and a direct benefit to the survival of the whole colony. Mole-rats appear to check these boxes by shaping tunnel networks that encourage the continuous growth of roots and tubers, much like a gardener tending rows of vegetables without ever pulling them all up at once, season after season.

This practice likely emerged over an extremely long evolutionary history, potentially spanning millions of years, which would make it one of the oldest known behavioral strategies for food management among living mammals. Researchers remain cautious about pinning down exactly when this behavior first appeared, but the broader idea has reached consensus within the scientific community: this is not an isolated accident, but a strategy rooted in a long-term evolutionary logic, passed down and refined across successive generations.

How this underground agriculture actually works

Tunnels designed like genuine gardens

Mole-rat colonies live in intricate tunnel networks, sometimes stretching dozens of meters beneath the surface. Rather than immediately eating every root they come across, some individuals deliberately leave part of the root system intact, allowing the plant to keep producing new tubers season after season. By digging their tunnels in particular, recurring patterns, they also help nutrients and moisture circulate around these plant reserves, functioning almost like a natural irrigation system shaped by generations of rodents.

This management style offers a clear and measurable evolutionary advantage: a colony that preserves its food resources rather than exhausting them all at once enjoys a far more stable supply over the long run. In an underground environment where food can be scarce and hard to locate, this sustainable management strategy amounts to a considerable survival advantage, particularly during prolonged droughts or seasonal shortages of resources on the surface.

A striking parallel with fungus-farming ants

The case of the fungus-farming ants of South and Central America remains the gold standard of animal agriculture. These insects cultivate a specific fungus in dedicated underground chambers, feeding it carefully cut leaf fragments and eliminating parasites that threaten the entire crop. The parallel with mole-rats is striking: two very different animal lineages, one made up of social insects organized into colonies, the other of solitary or semi-social burrowing rodents, independently converged on a remarkably similar strategy for actively managing food resources.

This evolutionary convergence is of particular interest to researchers studying animal behavior, since it suggests that agriculture, far from being an exclusively human invention, can emerge naturally in species facing similar environmental pressures: a valuable and hard-to-replace food resource, combined with a lifestyle stable and sedentary enough to justify a long-term investment in careful upkeep. Some specialists even argue that the underlying logic is simpler than it looks, since any species that can afford to wait, rather than consume everything immediately, stands to gain a lasting advantage over neighbors that cannot resist the urge to eat every last root in sight.

What this discovery changes for science

Redrawing the boundaries of animal behavior

For a long time, agriculture was seen as a marker exclusive to specifically human intelligence and culture. The discovery of agricultural behaviors among mole-rats now forces scientists to seriously reconsider this traditional view.

It's always a little dizzying to realize that a behavior we thought was reserved for our own species finds an echo, however modest, in a blind creature living in the total darkness of a tunnel. This takes nothing away from our own technological and cultural achievements, but it does invite a healthy dose of humility about what actually makes a behavior truly unique in the animal kingdom. Scientific publications on the subject, notably featured in journals like Nature and reference platforms like PNAS, are now working to document the underlying mechanisms more precisely.

Research questions that remain wide open

Researchers are particularly curious about the transmission of this complex behavior: is it an innate instinct, genetically programmed through evolution, or a form of social learning passed down from generation to generation within colonies? This question remains hotly debated, and the answers could carry far broader implications for understanding how complex behaviors emerge and persist in social or semi-social species.

Some scientists suggest this behavior could be more widespread among other burrowing species than previously thought, but simply less studied due to a lack of sufficiently long and detailed field observations. Direct observation of wild colonies over several consecutive years remains a major logistical challenge for research teams, which partly explains why this discovery has only recently emerged in the specialized scientific literature.

A discovery that invites us to rethink our relationship with nature

Agriculture, an older invention than we thought

While humanity developed agriculture roughly ten thousand years ago, a major and well-documented turning point in its history, certain animal species have been practicing forms of active food management for considerably longer periods. This perspective challenges the idea of a strict hierarchy between instinctive behaviors and intelligent ones, showing that the line between the two is far blurrier than we once imagined.

For biologists, these discoveries reinforce the value of studying often-overlooked species, such as burrowing rodents, which live in environments that are difficult to observe but hide unsuspected treasures of behavioral complexity.

We tend to reserve our fascination for spectacular large mammals or charismatic predators, while some of the most astonishing discoveries in science are hiding literally beneath our feet, in total darkness.

Why this story fascinates the general public so much

This discovery quickly sparked enthusiasm among the general public, reported by numerous science outlets such as Futura-Sciences and Sciences et Avenir. It perfectly illustrates what makes science communication so captivating: a fact as seemingly simple as a rodent tending its underground roots can, once placed in its evolutionary context, tell a story millions of years old about the unsuspected ingenuity of living things.

It also reminds us that nature still holds countless undocumented behaviors, and that major discoveries can emerge from species we thought we already knew well. Mole-rats, long dismissed as simple burrowing creatures with little behavioral interest, thus become the quiet heroes of a fascinating new chapter in the natural history of animal food strategies.

Questions that still puzzle researchers

Which species exactly, and in which regions

I always find it remarkable how much patience this kind of fieldwork demands: months, sometimes years, of silent observation just to confirm a single animal behavior.

Not all mole-rat species necessarily practice this behavior in the same way, and researchers are still working to map precisely which populations, in which regions of the globe, develop this strategy of actively managing roots. This mapping is essential to understanding whether the behavior arose only once in the group's evolutionary history, or whether it emerged independently multiple times in different lineages, a phenomenon biologists call convergent evolution.

Answering this question requires prolonged field observation campaigns combined with comparative genetic analyses between populations. It is slow, painstaking work, but the initial results already suggest this behavior could be more geographically widespread than early research teams originally assumed.

What impact on underground ecosystems

Beyond simple scientific curiosity, this agricultural behavior among mole-rats could have a measurable impact on the underground ecosystems in which they live. By maintaining certain roots rather than destroying them entirely, these rodents influence local plant composition and the very structure of the soils they have inhabited for generations. This quiet role as an ecosystem engineer deserves further study, since it could have ripple effects on surrounding plant biodiversity and the overall health of the soils involved.

Researchers hope future studies will help quantify this impact more precisely, notably by comparing areas inhabited by colonies that practice this behavior with similar areas where the rodents are absent or less active in managing their tunnels. Such comparative fieldwork, while slow and resource-intensive, could eventually reveal whether these small farmers of the underground are shaping entire plant communities far beyond the immediate radius of their tunnels.

What to take away from this discovery

A rare but revealing behavior

What strikes me most about this story is the modesty of the subject: a small, discreet, almost invisible rodent that nonetheless redraws our certainties about the origins of agriculture.

In short, certain mole-rats actively maintain networks of underground roots and tubers, a behavior resembling a form of rudimentary agriculture that may trace back millions of years of continuous behavioral evolution. This phenomenon joins that of the fungus-farming ants on the very short list of animal species known to actively cultivate their own food, rather than simply gathering or hunting it.

This discovery, documented by scientists and widely reported notably by National Geographic, shows just how much the underground world remains a research field rich with surprises for scientists specializing in animal behavior. It reminds us, powerfully, that biological ingenuity is never confined to a single species, nor to a single geological timescale.

An invitation to keep observing the living world

Beyond the fascinating anecdote, this story illustrates a broader and lasting lesson: science keeps revealing unsuspected behaviors in species we thought we already knew well. Every new field observation, every study published in specialized journals like Nature or PNAS, enriches our understanding of the living world and pushes us to stay curious about the hidden complexity of the nature around us.

This curiosity, nourished by publications accessible to the general public, helps bridge cutting-edge scientific research with our everyday wonder at the small marvels that nature hides, sometimes quite literally, beneath the surface of the ground we walk on every day without a second thought.

By Maxime Marquette, columnist

Sources

Primary sources

National Geographic France — Découvertes d'espèces et comportements animaux — 2026

Nature — Animal behaviour, ressources de recherche — 2026

PNAS — Proceedings of the National Academy of Sciences — 2026

Secondary sources

National Geographic France — Portail principal — 2026

Futura-Sciences — Rubrique Planète — 2026

Sciences et Avenir — Actualités scientifiques — 2026