There is a feral ferret population on the Earth. It is in New Zealand. These ferrets were released into the wild by humans. They were supposed to control the overpopulation of wild rabbits, which were also intentionally introduced into New Zealand by humans. Next time humans should only introduce animals that have a natural enemy in that habitat.
Ferrets are the third most popular pet in the world.
I spoke to a lady who has fourteen ferrets and her husband has three. At one point she had twenty one. She runs a ferret shelter in northeast Ohio. The ferret shelter exists to help ferrets who had owners who can't take care of them properly or get them spayed, like cats and dogs. The ferret expert that I spoke to says there is an estimate of 750,000 domestic ferrets in the United States.