Feral Hogs - Google it and see the scale of the problem in the US. They stroll through my yard from time to time, unperturbed. Never get near a Sow with her litter near by. She will react like a Grizzly Bear with cubs. The reports of what happens if you hit a big Boar at speed are accurate. Just near me, a guy on a motorcycle broadsided one at night. The Hog survived and fled the scene. The "pilot" of the two wheeled Hog did not.