[Mountain_Skies]

Biological warfare, in one form or another, might be the only way, but that comes with risks that are probably unacceptable, even in light of the amount of damage they cause.

[HarryHirsch]

Put lions in - wolves are too small, and jaguar won't touch them, jaguar is solitary but pigs come in packs.

[ETH_start]

Lions can't handle the Canadian climate, Siberian tigers can, and they are proficient boar hunters.