Nepal tests synthetic scents to steer tigers and leopards from settlements
The story at a glance
Researchers are testing synthetic scent compounds at camera-trap stations in Nepal’s Khata Corridor, with the aim of influencing tiger and leopard movements away from people and livestock. The trial is assessing animal responses, not yet whether the method prevents attacks or reduces conflict. 12
Early results suggest responses vary: some compounds were associated with fewer detections of big cats, while others attracted them. Researchers and authorities describe the findings as preliminary, with further testing needed before settlement use. 134
What you need to know
- The Nepal field trial involves researchers from Cornell University, WWF Nepal and Nepalese authorities. Synthetic compounds are being tested at camera-trap stations in the Khata Corridor to see how tigers and leopards respond. The current test does not establish whether scent barriers can prevent livestock losses. 12
- Mongabay reports that three of ten compounds were associated with fewer leopard detections, and two with fewer tiger detections. Some compounds attracted cats, and responses varied by species and location. Camera detections are a measure of observed presence, not proof of fewer attacks. 14
- The Kathmandu Post reported that five compounds appeared effective in an earlier trial: leopards and wild boar fled, while tigers approached before turning back. That account also described further testing as necessary before the approach is used near settlements. The reports do not share a single definition of effectiveness. 31
- The approach draws partly on case studies from Botswana and Zimbabwe involving 3M3MB, a component of leopard urine. A preprint describes fewer leopard detections and livestock losses in those cases, but at one site detections rose again after five months of continuous use. These findings do not show that the Nepal trial will have the same results. 51
- Practical questions include whether scent barriers would shift risk to nearby households or grazing areas, and whether animals might become habituated. Weather, dispenser placement, replenishment, cost and maintenance could also affect how the method works in practice. 12
Why this matters
Conflict involving large carnivores can affect people and livestock, and the trial explores a non-lethal way to influence animal movements. But behavioural signals alone cannot show whether households experience fewer attacks or whether risk moves elsewhere, so those outcomes matter when judging the method’s conservation value. 12
What happens next
The Nepal trials require further testing before the approach is used around settlements. Researchers will need to establish whether behavioural changes are repeatable across animals and sites, and whether any change in detections translates into fewer livestock attacks without shifting conflict to other areas. 123
What we know
- Synthetic scent compounds are being tested at camera-trap stations in the Khata Corridor. 12
- Some compounds were associated with fewer leopard or tiger detections, while others attracted cats. 14
- The Nepal findings reported so far are preliminary and do not establish a reduction in livestock attacks. 123
What we don't know
- Whether changes in detections reflect repeatable movement changes across individual animals and sites. 12
- Whether the compounds reduce livestock attacks and human-wildlife conflict, or shift risk to other households or grazing areas. 12
- How long any effects last under local weather and prolonged exposure, and whether animals habituate. 12
- What dispenser spacing, replenishment, cost and community-maintenance arrangements would be needed for practical use. 12
Read the reporting
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