You cannot stop the migration of pigs. That was proved in Australia. Even when a scientific study was commissioned in the 1970's whereby, an area was divided by fence and all the pigs shot out on one side, the buffalo thrived where the pigs were removed and caused to buffalo to migrate where they were left.
The only way currently to control pigs is with the bullet. That was a major influence on the government in NSW, an eastern state in Auatralia, to validate the formation of a proposed Game Council run by hunters to permit the culling of feral animals in national parks, something that never occured in Australia's history.
Public land was always forbidden to hunters which is the complete opposite of what happnes here in the US.
Pigs will spread and they can only be controlled at this stage, by the bullet. Aussie hunters killing a couple of hundred over a good weekend or a week is not rare.
AGW
