Business Insider reports that dogs that escaped Chernobyl -- after the nuclear reactor opened releasing plumes of radioactive material into the air -- mated with others and released hundreds of their descendants to roam around the exclusion zone. Thirty years later, some of these dogs are getting adopted. The Clean Futures Fund, a humanitarian organization, has been helping to spay, neuter, and vaccinate the stray dogs. Many of the youngest dogs have been determined to have safe levels of radiation and are being put up for adoption. A nuclear-waste-disposal researcher at the University of Sheffield said, "They're very friendly, but you want to avoid petting them." The grown dogs can carry radiation in their fur. The puppies are the first animals to ever be allowed outside the exclusion zone.