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There are also tons of people in California who already own ferrets illegally (one of my friends growing up did) and yet there's no feral ferret problem in California. Meanwhile there are now feral parrot populations (descended from escaped pets) in my hometown near San Diego that weren't there 15 years ago, and I haven't heard anyone talk about banning parrots for that reason.

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It's really rare for an escaped "pet ferret" population to boom on it's own, since most ferrets purchased in the pet trade (i.e. not specifically purchased for breeding) are already spayed/neutered. This isn't the case for most other pet species.

IIRC, this is done because female ferrets who go into heat can/do die if they don't mate and male ferrets will become quite hostile when near a female in heat.

To be fair, parrots aren't carnivores that directly eat the native wildlife.

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