https://phys.org/news/2018-07-quolls-born-australian-wild-century.html

Twenty of them were returned to their native environment in the Booderee National Park, south of Sydney, in March to see if they could survive and thrive.

It is the first time in Australia that a carnivore extinct on the mainland has been re-introduced to the wild and followed a 15-year project to bring feral predators in the area under control.