Forty years after Chernobyl: wildlife thrives, but the science remains contested

Four decades after the 1986 reactor explosion, the 60km exclusion zone around Chernobyl has become an unlikely wildlife refuge. Wolves, bears, lynx, bison, deer and feral dogs now populate landscapes humans abandoned, with wolf populations estimated at seven times higher than in surrounding reserves. Brown bears returned after a century-long absence. The dominant driver appears to be the sudden withdrawal of humans rather than any biological resilience to radiation.

That said, researchers have documented genuine biological oddities: darker tree frogs inside the zone (possibly melanin-mediated protection, per Pablo Burraco’s team), elevated mitochondrial diversity in bank voles, twisted trees, tumours in swallows, and a black radiotrophic fungus growing inside the reactor ruins. Whether these represent radiation-induced mutations, true evolutionary adaptations, or responses to confounding factors like heavy metal contamination and a shifted forest composition (birch replacing radiation-sensitive pine) remains hotly disputed. Critics like Timothy Mousseau challenge sampling methodology and the correlation with current radiation levels.

The broader takeaway: Chernobyl is neither the dead zone early predictions imagined nor a clean rewilding success. It is a contaminated, ecologically altered landscape where the absence of humans has outweighed the presence of radiation for many species, while the question of genuine radiation-driven adaptation in soybeans, voles and fungi stays scientifically open.