Wild pigs causing 'ecological disaster' in Canada mercredi, 15 mai 2019 à 16:14 - 'There is crop damage, disease transmission, even automobile crashes'. For the first time, researchers have mapped the range of wild pigs across Canada and found the invasive swine are expanding at a rapid rate. Wild pigs are now Canada's most prolific invasive mammal, according to what the University of Saskatchewan calls the first-ever published survey of their distribution in Canada — and they're causing an "ecological disaster." Wild pigs are now Canada's most prolific invasive mammal, according to what the University of Saskatchewan calls the first-ever published survey of their distribution in Canada — and they're causing an "ecological disaster."