It's very hard to get control of invasive species. In a story here about tumbleweeds I said these were an invasive species from Russia, wondered what from the Americas had invaded the rest of the world, and a bunch of responders provided examples [0].

[0] https://news.ycombinator.com/item?id=21967020

Senestech's system for controlling rodents [1] is an ovary poison that stops female rodents from reproducing. The system is deployed continuously to keep rodent populations down in cities. But trying to kill all the rats in a city is probably not a good idea either: "A Vancouver rat study is showing us how pest control can backfire... " [2]:

>> [Rats] may be just as much a part of our city as sidewalks and lampposts. We would all be better off if, under most circumstances, we simply left them alone. [2]

Invasive ferrel/hybrid pigs are not comparable to rats, and I don't think a case can be made to let them alone. Maybe something like contrapest [3] could be developed for these invasive hybrid/ferrel pigs.

[1] https://senestech.com

[2] http://nautil.us/issue/38/noise/the-case-for-leaving-city-ra...

[3] https://en.m.wikipedia.org/wiki/ContraPest