Chernobyl’s Wolves Are Thriving in a Radioactive No-Man’s-Land. Their Genes May Explain Why

Humans seem to be worse than nuclear radiation for wildlife.

Forty years after the Chernobyl disaster, the exclusion zone has become one of the world’s strangest wildlife refuges. Animals from worms and frogs to dogs are thriving in the area, despite the high levels of radiation. But wolves are doing particularly well.

Gray wolf populations are now reported to be seven times higher than before the accident, largely because people left (taking farming, hunting, roads, and development with them). Even with a full-scale war raging around the abandoned city, wolves seem to do better when there are no humans around.

But it gets even more interesting. According to recent research, they’re even developing genetic changes that make them more resilient against cancer.

Nuclear Fallout and Wolves

Before the explosion, the town of Prypiat was a classic Soviet landscape: farms, roads, forestry, industry, livestock, machinery. Wildlife was pressured, and wolves were often shot on sight.

After Reactor Unit 4 exploded on April 26, 1986, radioactive material spread; first across the town, then across Europe. Pine trees near the plant absorbed so much radiation they died and turned a ghostly rust color, giving rise to the infamous “Red Forest.” More than 300,000 people were eventually evacuated from the wider region. The landscape was emptied and the humans left, taking with them all the activity.

Then, the wolves came in.

The region was far from an Eden. The zone carried radioactive contamination and the reactor itself is a problem wrapped inside another problem: the old sarcophagus, then the giant New Safe Confinement arch, damaged by a Russian drone strike in February 2025. Repairs are now estimated at about €500 million.

But despite all this, wildlife is thriving.

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Elk, roe deer, rabbits, wild boar, lynx, horses, and even bears have also returned or expanded. Despite all the adversity, the fact that humans left is enough to make Chernobyl a sanctuary.

“Wolf populations are seven times higher than they were before the accident because there is less human pressure,” said Jim Smith, an environmental scientist at the University of Portsmouth, who has been studying the region for more than 30 years, for The Guardian.

“The ecosystem in the exclusion zone is much better than it was before the accident,” Smith said. “It’s been a very powerful demonstration of the relative impact of the world’s worst nuclear accident, which is not so big, and the impact of human habitation, which is devastating.”

Radiation Adaptation

The uncomfortable lesson of the story isn’t that radiation helped wildlife. It is that removing people helped some wildlife even more. But there’s another story about adaptation.

Researchers led by evolutionary biologists Cara Love and Shane Campbell-Staton studied the wolves using GPS collars that also recorded radiation exposure. The wolves were estimated to absorb more than six times the legal safety limit cited for an average human worker. Yet the population has not collapsed.

Instead, they seem to be adapting to the radiation. Blood and genetic analyses found 3,180 genes behaving differently in Chernobyl wolves compared with reference populations, including wolves from Yellowstone and less contaminated nearby regions. Many of those changes clustered around immune function and cancer-related pathways.

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The team also identified 23 cancer-related genes that stood out. One gene in particular, PTPN6, was highlighted in the report as a possible marker linked to cancer resilience. This doesn’t mean the wolves are immune to cancer or that they don’t care about the radiation. Rather, it means their biology may be showing signs of selection under pressure: wolves better able to manage DNA damage, inflammation, or early tumor formation may be more likely to survive and reproduce.

This also doesn’t seem to be happening for all species in the region. For other species (especially smaller ones), the story might be much less optimistic.

Studies show reduced reproduction and biological stress in birds such as barn swallows and great tits, including sperm abnormalities, oxidative stress, and reduced antioxidant levels. Other research has reported declines in insects, soil invertebrates, and bird abundance in more contaminated areas.

Hard Lessons

Ultimately, there’s more than one story here. There are several overlapping stories, written at different scales.

The world’s worst nuclear accident created a landscape that remains contaminated with cesium-137 and other radionuclides. The damaged reactor still contains dangerous radioactive material. Now, war has added to that risk. The site is once again vulnerable, now due to military conflict. A 2025 drone strike pierced the protective structure over Reactor No. 4, while officials said radiation levels did not spike but repairs are urgent.

And yet, despite all this, some wildlife is thriving.

This contaminated landscape is, at least for some species, far preferable to the daily pressures of human civilization. The region has become a massive natural experiment that holds valuable lessons for conservation and rewilding. The Chernobyl wolves are evidence that wildlife can sometimes withstand much more than we thought, while the smaller birds show that our environmental pollution is never without dire consequences.

Chernobyl doesn’t have a happy ending, or at least not yet. But it shows that even in the face of enormous disasters, life can find a way. It’s not neat and it’s not clean, but it’s definite proof of resilience.

Editor’s note: This article uses the spelling “Chernobyl” to reflect the 1986 disaster, when Ukraine was part of the Soviet Union and Russian transliterations were widely used. The Ukrainian spelling is “Chornobyl”.