Tanzanian ‘Hero Rats’ Trained to Sniff Out Land Mines, Tuberculosis and Survivors

MOROGORO, Tanzania — In a simulated earthquake scene in the Uluguru Mountains, an unlikely first responder slipped through toppled furniture and scattered clothing, paused at a prone figure and nudged a small pack on its back. A click sounded above and handlers rushed in. The rat was rewarded with a banana.

The demonstration in Morogoro was part of an initiative by APOPO, a Tanzania-based nongovernmental organization, to train African giant pouched rats for search-and-rescue operations and scent-based detection tasks. The animals on display are trained not only to locate survivors but also to detect land mines and tuberculosis, according to organizers.

"Their sense of smell is incredible," said Fabrizio Dell’Anna, an animal behaviorist at APOPO. "These rats are able to detect explosives, tuberculosis — even tiny amounts of the bacteria — and in this project, they are able to correctly identify and indicate humans."

Handlers led several rats on leashes through a field laid out in a grid that contained land mines as part of the exercise, which APOPO conducted in partnership with Sokoine University of Agriculture. When a rat paused at a search location, it would activate a device on its harness to signal the find to observers, a behavior reinforced with a food reward.

APOPO, which has trained rodents for a range of detection roles, presented the exercises to demonstrate how the animals can be deployed for lifesaving applications. In the simulated collapsed building, the rats navigated debris and obstacles to reach a human subject placed as a mock survivor, performing a trained indicator when they located the person.

Organizers said the rats’ detection abilities extend beyond locating people. APOPO trains them to recognize the scent of explosives for mine-clearance operations and the odor associated with tuberculosis bacteria, which can allow for screening of samples or environments where the disease is present. Dell’Anna emphasized the animals’ olfactory sensitivity as key to those tasks.

The demonstration comes amid ongoing efforts by organizations and research groups to explore cost-effective, rapid methods for detecting land mines, infectious diseases and other hazards. APOPO’s program pairs behavioral training with field protocols developed alongside academic partners, including Sokoine University of Agriculture, to prepare the animals and handlers for operational use.

APOPO said the training uses positive reinforcement and repeated exposure to target scents and scenarios to shape reliable detection behavior. Handlers monitor and cue the animals, and devices on the rats’ harnesses provide a clear, audible signal when an animal performs its trained indication.

Rats used in APOPO programs are African giant pouched rats, a species noted for its acute sense of smell and trainability. APOPO has described scent-detection projects as part of broader efforts to reduce risks from unexploded ordnance and to improve disease screening in communities where conventional laboratory diagnostics can be limited.

Officials and trainers said further work will focus on refining field protocols, continuing partnership activities with local institutions and demonstrating the animals’ capabilities under controlled conditions that mirror real operational needs. APOPO described the Morogoro exercises as a step in preparing animals and handlers for practical deployment in mine-affected areas and health-screening initiatives.