People stay in charge
Rats do not clear mines or diagnose illness. Trained people confirm every important result.
01 · Meet the HeroRATs
A strange idea that worked
APOPO began in Belgium in 1997 with a simple question: could a rat's sense of smell help people find landmines?
The team moved its training work to Tanzania. There, giant African pouched rats learned to search for one exact smell and ask for a reward when they found it.
The rat finds a clue. A trained person decides what happens next.
1997
The year APOPO formally began testing the idea
Why a rat?
Built to follow a smell
The rats do not look for metal. They learn the smell of explosive material, so old nails and scraps do not distract them.
They are also light. APOPO says the rats are too light to set off the mines they encounter in accredited work.
◌A sharp sense of smell
♙Light enough for the job
●Happy to work for food
Advertisement · keeps Undertold independent
02 · How they learn
Smell. Click. Treat.
Training uses kindness and repetition. When a rat finds the target smell, the trainer makes a click and gives it food. Getting the answer right starts to feel like a game.
Full training usually takes nine months to a year. Mine-detection rats must also pass an outside test before they can work.
Try the first lesson
Choose the jar that smells like the training target.
The rat gets a treat only when it chooses the target smell.
03 · In a minefield
The rat marks the spot
First, people learn where danger may be hiding. They clear plants and divide the land into small search areas.
A rat moves across each area on a line. If it smells explosives, it scratches the ground. Then the rat moves away.
A human deminer carefully checks the spot and deals with the explosive.
Search one small area
Tap squares to guide the rat. One contains a hidden training target.
Start anywhere. The rat will tell you when the scent gets strong.
searchedtarget found
The handoff matters
Two jobs. One safer field.
The rat can search quickly. The person brings judgment, careful excavation, and the authority to declare land safe.
🐀RatFinds the smell
→⛑DeminerChecks and clears
Advertisement · donation links never pay us
04 · A second hidden danger
The same nose, inside a lab
APOPO also works with clinics that test people for tuberculosis. Samples that a clinic called negative are safely prepared and brought to trained rats.
If a rat pauses over a sample, laboratory staff test it again with standard methods. Only a confirmed result goes back to the clinic.
The rat does not diagnose a patient. It helps the lab decide which samples deserve another look.
A second look
The rat flags a sample. The lab checks it.
05 · What to know
Remarkable, but not magic
The honest version of this story includes where the rats help—and where they do not.
Conditions matter
Mine work needs clear ground and suitable weather. Other places may need dogs, machines, or manual teams.
Results vary
TB studies have reported different accuracy. That is why the rats are a second check, not a final answer.
A small animal with a serious job
Help train the next HeroRAT
APOPO trains animals and people to find hidden dangers. If this work matters to you, learn more or donate directly to the organization.
Visit APOPO ↗Undertold is independent. APOPO did not pay for this story, and we receive nothing if you donate.