Wild boars
The "super pigs" are already spreading out of control in parts of Canada.
  • An invasive species of Canadian wild hogs is threatening to spread into the US.
  • According to the AP, the pigs are exceptionally hard to eradicate. 
  • They're a crossbreed of American and Eurasian hogs — resulting in a sort of "super pig".

Residents of the northern US may soon have to worry more about what was a once-ridiculed concept: warding off feral hogs.