Scent barriers instead of killing: New wolf study from Neuchatel

At the end of June 2026, the Swiss National Science Foundation presented a study by the University of Neuchatel that examines how wolf packs react to the urine markings of unfamiliar conspecifics.

While several cantons are expanding their kill numbers and politicians argue over fixed upper limits for the wolf population, a research team is focusing on a completely different question: can the behaviour of wolves be influenced through scents, without reaching for the rifle? This has not yet been answered, but the foundations for it are now being worked out in the laboratory.

How the experiment was set up

Between April and June 2024, researchers from the University of Neuchatel confronted five packs in four Swiss animal parks with unfamiliar scents. To this end, they set up scent stations consisting of an aluminium plate around 30 centimetres above the ground, in order to replicate the natural height of a marking. On each of the plates they placed three millilitres of wolf urine, thus feigning the presence of an animal from outside the pack. Human urine served as a control, so that the reaction to a supposed intruder could be distinguished from mere curiosity about something unfamiliar. Thirteen animals were observed, of which six were lead animals and seven lower-ranking female and male wolves, monitored continuously with camera traps.

Lead animals with offspring react most strongly

The result was clear: animals with offspring of their own engaged with foreign scent marks noticeably more often than low-ranking or young pack members. «These animals have more to lose,» the supervising behavioural researcher summarised the pattern. Those with a territory, young and a partner pay more attention to social signals. Overall, the lead animals approached the scent stations twice as often as the subordinate animals. With wolf urine, exploratory behaviour occurred roughly thirteen times more frequently than with the human comparison scent. In the low-ranking animals, by contrast, hardly any difference could be detected between the two scents; most only sniffed the stations briefly.

An individual case showed how strongly social rank shapes behaviour. During a preliminary trial in December 2023, a young, low-ranking she-wolf remained unimpressed by the scent of unfamiliar conspecifics. After she had herself risen to become the lead animal in another pack, she reacted far more markedly — a finding that was confirmed six months later. A scent mark is therefore not a mechanical trigger, but a piece of social information that is read differently depending on one's position in the pack.

From scent profile to scent barrier

The researchers' long-term goal is more ambitious than the experiment itself. Together with a biochemist, they want to create scent profiles by sex, age and social status and to test their effect first in wildlife parks, later in the wild. On the horizon is the idea of so-called scent barriers, with which herds could be protected from wolves without killing the animals. Such “biofences” have already been trialled with wild dogs and coyotes, but they have not yet been thoroughly investigated. A significant limitation of the current study: the wolf urine used came from the USA and could not be attributed to any known animal. The researchers themselves stress that it could still take years before this becomes a reliable instrument for field use.

Why this matters for Swiss wolf policy

The finding meets a debate that is largely conducted through the rifle. While individual cantons decimate packs and the federal government considers politically defined population targets, non-lethal herd protection remains the stepchild of official wolf policy. Yet Alpine practice in particular shows that consistent herd protection works, and the canton of Geneva has proven since 1974 that wildlife management can function without recreational hunting. Research that decodes the wolves' communication system instead of interrupting it with kills fits precisely into this logic: it seeks tools for coexistence, not new justifications for shooting. How deeply the shooting logic has seeped into the state's dealings with predators is documented in our dossier «The wolf in Switzerland: facts, policy and the limits of hunting».