After nearly 40 years, mutated wolves roaming the deserted streets of the Chernobyl Exclusion Zone (CEZ) appear to have developed cancer resistance, according to Princeton evolutionary biologist and ecotoxologist, Cara Love – who has been studying how the Chernobyl wolves have survived for generations while facing exposure to radioactive particles, Sky News reports.

Roughly 100,000 people were evacuated from the 1,000 square-mile CEZ in 1986, and it has remained abandoned ever since, as radiation still poses a risk.