Golden Jackals Expand Across Europe Behind a Human Shield From Wolves

In places where wolves have never returned, golden jackals respond to people as most wild animals do: by keeping their distance. Such wariness is normal for wild predators including jackals, and there was no reason to expect them to behave otherwise.

Yet the findings repeatedly revealed an outcome with no straightforward explanation. In areas occupied by wolves, jackals were gathering nearer to human settlements rather than moving farther away.

The golden jackal’s missing restraint

The golden jackal (Canis aureus) is a wild canid that is smaller than a wolf but larger than a fox. During the past few decades, it has expanded through Europe at a remarkable rate, although the reasons have never been fully agreed upon.

Researchers led by Nathan Ranc, a movement ecologist who earned his doctorate at Harvard and now works at the French National Research Institute for Agriculture, Food and Environment (INRAE), identified a decisive explanation. More than any other animal, one species was limiting the jackal.

That species is the grey wolf. In territories claimed by wolves, jackals generally kept away. Across the full dataset, this was the clearest individual pattern.

Listening for jackal howls

Because counting jackals throughout a continent is difficult, the researchers used the animals’ most audible behaviour: howling. Survey teams in 13 European countries played recorded calls at night, then listened for a response.

The dataset covered almost 9,000 listening sites between 2001 and 2017, providing one of the widest records of jackal presence assembled so far. An answer from the darkness indicated that a jackal was nearby, while silence generally suggested there were none.

Howling has become a standard method for detecting these animals, while another paper has refined sound-based techniques for locating them. Even so, the surveys record where jackals call rather than every individual concealed beyond the microphones.

Wolves drive jackals away

Within wolf territory, jackals fell silent or disappeared. The farther surveyors moved into wolf range, the less likely jackals were to respond at all.

Wolves do not accept these smaller predators. They drive them away, vie with them for the same food, and can sometimes kill them, leaving jackals with every incentive to remain distant.

This pattern resembles events in North America, where wolf decline allowed coyotes - similar to jackals in both size and behaviour - to spread out. Until now, however, whether the same force shaped Europe had remained unresolved.

Shelter near people

At this point, the study takes an unusual turn. Close to towns, farms and roads, the wolf’s influence seemed to lessen.

Jackals returned to places from which wolves had otherwise excluded them. The researchers describe this as a human shield: animals remaining close to people because the predator that threatens them avoids humans.

The difference is striking. Without wolves, jackals avoid developed areas; where wolves are present, they move closer to human settlement. They are exchanging one risk for a smaller one - a calculated gamble.

Exactly why people offer this cover has not been fully established. Wolves usually avoid heavily populated places, while jackals benefit from the food scraps people leave behind, a behaviour documented by one study of their diet.

Nobody had previously demonstrated this shielding effect at a continental scale. It reframes the golden jackal’s expansion as more than a simple flight from wolves: human presence has quietly made it possible.

Space for continued expansion

The team’s map of potentially suitable jackal habitat produced a striking result. Its model identifies about 75% of Europe as viable territory - almost six times the area the species currently occupies. There is evidently substantial space for further expansion.

At present, jackals are concentrated in south-eastern and central Europe, although roaming individuals have travelled as far west as Spain and as far north as the Arctic. Milder winters, fragmented woodland and nearby water all increase their chances.

Jackals are mesopredators - mid-level hunters beneath apex predators - adapted to take advantage of openings. Warmer conditions and landscapes reshaped by people continue to create more such opportunities, a pattern tracked by another jackal study.

Wolves against the human shield

Wolves are also recovering, creating an opposing pressure. The model indicates that a more complete wolf recovery could reduce suitable jackal range by up to 18% over the coming years.

That will not be sufficient to halt the expansion. The human shield persists as wolves come back, and, with gentler winters and continually altered landscapes, golden jackals are expected to keep extending their range.

This conflict points to a broader lesson. Restoring a top predator was intended to restore balance, but our own footprint can weaken the ecological repair wolves are meant to provide.

What changes now

What had been uncertain is now apparent. The grey wolf is the principal constraint on golden jackal expansion - rather than climate or habitat alone - while human presence is the mechanism that loosens that constraint. Scientists had long presumed this relationship for American coyotes. It has now been demonstrated in Europe.

For wildlife managers, this alters the calculation. Killing jackals around towns is unlikely to stop their advance while the shield remains in place. Wolf protection may slow the spread more effectively than any cull, although it brings conflicts of its own.

The map also identifies the next areas to monitor, from western farmland that jackals have scarcely reached to northern forests only now being explored. A scavenger that clears carcasses and follows human settlements is likely to become an established presence throughout Europe.