07/07/2026
Interesting read on a different feral pig problem coming our way….
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Feral pigs on the Canadian prairies are surviving winters that drop below minus 40 by cutting down cattails with their teeth, piling them into mounds, tunneling underneath, and letting the snow bury the structure into an insulated den that steams in the cold. Researchers at the University of Saskatchewan call these shelters pigloos. They call the pigs that build them super pigs. Neither term is a joke.
In the late 1980s and early 1990s, the Canadian government encouraged prairie farmers to import European wild boar as an alternative livestock species. The idea was diversification. Raise boar alongside cattle. Sell the meat. Some operations also imported boar as penned game for paying hunters. The market peaked around 2001 and then collapsed. Some farmers sold their stock. Others could not. A number of them dealt with the problem by cutting their fences.
The boar walked out and bred with feral domestic pigs already loose on the landscape. The offspring inherited the wild boar's survival instincts, cold tolerance, thick fur, and wariness of humans, combined with the domestic pig's larger body size and higher reproductive rate. A Eurasian wild boar in its native range produces smaller litters and matures more slowly than a domestic pig. The hybrids do neither. They can weigh over 600 pounds. Both males and females grow tusks. They reach sexual maturity in four to eight months. They produce litters of six to sixteen piglets, one or two times a year, in any season.
Ryan Brook, a professor at the University of Saskatchewan and lead researcher for the Canadian Wild Pig Research Project, has been tracking the expansion since the early 2000s. His team has documented over 62,000 wild pig sightings across Canada. A 2019 study published in Scientific Reports, led by doctoral candidate Ruth Aschim, who spent three months living out of her tent and car while mapping pig distribution across western Canada, found that the animals had increased their range by an average of 88,000 square kilometers per year between 2011 and 2017. Their total range now exceeds 750,000 square kilometers. They occupy territory from British Columbia to Ontario and Quebec, with the heaviest concentrations in the south-central prairies of Saskatchewan, Manitoba, and Alberta.
The geography is the part that makes no sense until you understand the biology. In the United States, feral pigs are concentrated in warm southern states. Texas, Florida, the Gulf Coast. In Canada, the coldest provinces have the most pigs. The explanation is the pigloo and everything it represents. These animals are not enduring the cold. They are engineering around it.
They cut cattails, pile them, burrow in, and the snow that buries the mound adds insulation. On the coldest days, Brook says, the pigloos visibly steam from the body heat trapped inside. Beneath the snow, the pigs use their sense of smell to locate roots, bulbs, seeds, and tubers buried in frozen ground. They eat crops, insects, birds, reptiles, small mammals, and anything else they find. Brook calls them the most invasive animal on the planet and an ecological train wreck.
Saskatchewan tried hunting. It made the problem worse. When the province opened a hunting season, the pigs responded by going nocturnal and scattering into new territory. Shooting a few individuals from a sounder broke the group apart and spread the survivors into areas that had not previously held pigs. Brook says sport hunting is the worst possible management tool for feral swine because every hunt that fails to kill the entire group teaches the survivors to avoid humans more effectively.
Eradication is no longer considered possible in Manitoba or Saskatchewan. The population is too large, too dispersed, and too reproductively efficient. Brook's aerial surveys have documented pigs on both sides of the Canada-North Dakota border. A sighting in Manitoba placed pigs within 17 miles of Minnesota. Montana has taken the threat seriously enough to ban the importation and possession of wild boar. North Dakota has a response plan. Brook's assessment is blunt: nobody should be surprised when pigs start walking across that border if they have not already. The question is what will be done about it.
The answer, so far, is not enough. The farmers who cut their fences thirty years ago created a problem that two countries, thirty-five U.S. states, and an annual USDA budget in the tens of millions of dollars have not been able to solve. The pigs are still expanding. The pigloos are still steaming. And the border is a line on a map that a 600-pound hybrid with tusks and a litter of twelve does not recognize.
Source: Brook and Aschim (2019), Scientific Reports / University of Saskatchewan / National Geographic / CBC News / Associated Press / Canadian Geographic.
