Wild boars go into cattail marshes, channel into the soft snow and cut nests in the cattails, where steam can be seen pouring out of the top of the nests on cold early mornings.
Brook also notes that there is no physical or biological boundary at the U.S.-Canada border and that there is hardly any fencing to speak of. There is a real risk of wild pigs moving south into the United States.
Despite the difficulty of eradicating wild pigs, local authorities are taking measures to mitigate their spread, one of which is ground-trapping entire sounders, according to Brook, is one of the most effective control strategies.
Brook suggests that the most important thing people can do is to alert authorities, report any sightings of wild pigs and participate in programs like the "Squeal on Pigs" program in the U.S. and Canada or report it to local game wardens. Early detection and action are critical, according to Brook.