Tasmanian devil populations have been devastated over the past 25 years due to devil facial tumour disease, an infectious cancer. But the Tasmanian government does not support relocating uninfected wild devil populations to the Australian mainland. Wildlife vigilantes have, however, already illegally moved Tasmanian devils off the island — an illegal practice known as “covert rewilding”. They may well might try again. Our recent research has examined this possibility.