Nepal Tests Artificial Scent Markers to Redirect Tigers and Leopards

Testing scent as a boundary

Nepal’s synthetic scent stations are designed to test whether a big cat’s territorial instincts can steer it away from villages, farms and livestock. The idea is straightforward: place an odor associated with big-cat scent marks along a route and see whether an approaching animal investigates, hesitates or changes direction. Early camera-trap footage shows tigers and leopards investigating the devices and turning back, though researchers say that behavior doesn’t yet show the approach can prevent attacks.

That distinction matters. A camera recording an animal turn away captures a moment, not the larger sequence of events that determines whether a household is safer. The animal could take another path, return later or react differently to a station in another setting. The footage offers a reason to keep testing the idea, but it doesn’t establish that the scent changes where predators go over time.

What the camera traps show

One Bengal tiger (Panthera tigris tigris) encountered a station in March 2025 along a forest trail in the Khata Corridor. The dispenser, mounted on a small iron stake, released a lab-made version of a chemical found in big-cat scent marks. The tiger approached, investigated the odor and stopped.

That sequence is informative in a limited way: it shows the device drew the tiger’s attention and that the animal didn’t simply continue past it in the recorded encounter. But “stopped” is not the same as “was deterred,” and a single encounter can’t establish a reliable response. Camera traps can document behavior at a station; they can’t, on their own, show whether the animal would otherwise have reached a village, farm or livestock enclosure.

The same caution applies to footage of leopards. Seeing more than one kind of big cat investigate a device suggests the scent may be noticeable across species, but it doesn’t establish that they respond in the same way or that the response lasts. The researchers’ question is whether these compounds can reliably change predator behavior. That’s a more demanding test than recording an animal’s first reaction.

From reaction to protection

Martin Gilbert, a wildlife veterinarian, epidemiologist and associate professor at Cornell University who helped bring the research to Nepal, said the project is still testing whether the compounds can reliably change predator behavior. “It’s a long way from proving that — and we don’t claim otherwise,” he said.

His qualification sets the right standard for judging early results. A deterrent meant to reduce conflict has to do more than provoke curiosity or pause an animal briefly. Its practical value depends on whether the response is repeatable and whether it changes encounters in ways that protect people and livestock. The source provides no evidence yet that the scent stations have reduced attacks.

There’s also a gap between the behavior visible on camera and the outcome communities need. A tiger or leopard turning back at one station might still find another route, while an animal that investigates could return after the odor has become familiar. These are possibilities to test, not results established by the footage. The project’s claims will need to stay tied to what monitoring can actually show.

How scent stations fit alongside existing deterrents

Communities in Nepal’s buffer zones already use electric fences, flashing lights and other deterrents to protect livestock from tigers, leopards and snow leopards. The scent stations add another approach to investigate. Their appeal is easy to understand: they try to influence an animal’s movement through its response to a scent, rather than relying only on a physical barrier or a visible signal.

But a different mechanism doesn’t automatically mean a better result. Fences, lights and scent devices may work under different conditions, and the source doesn’t compare their effectiveness. For communities, the useful question isn’t whether the technology is unusual; it’s whether it reduces encounters without simply shifting where or when those encounters happen. And this is the part most people overlook: a local turnback can look promising while leaving the wider pattern unchanged.

If you’re working in this space, the key measure is what happens beyond the camera frame. Researchers will need to determine whether animals keep responding to the scent, whether they avoid the places the stations are meant to protect, and whether people and livestock face fewer encounters. The available account doesn’t say how those questions will be measured, so it would be premature to assume the devices are ready for broad use.

What the early evidence means

This is more significant than it looks as a research question, because it tests whether a sensory cue can alter the movement of predators near places where people keep livestock. Yet the early footage supports only a narrow conclusion: big cats have investigated the stations, and some have turned back in recorded encounters. That’s a useful starting point. It isn’t proof of prevention.

The next stage of the work will matter more than the novelty of the dispenser. If repeated observations show that the scent reliably redirects animals and that communities experience fewer encounters, the approach could become a meaningful addition to local deterrents. If animals merely pause, investigate or take another route, the practical benefit may be smaller than the first clips suggest. For now, the stations remain an experiment with a clear promise and an unproven result.

A woman with her goats in the buffer area in Bardiya. Image by Tulsi Rauniyar for Mongabay.

This article was originally published on Mongabay