Wildlife officials in three Northwest states are intensifying their battle against wild swine by launching a campaign urging hunters, anglers, hikers and others to report any feral pig sighting on a public hotline.

A bill passed last year in Oregon requires landowners to trap or shoot any feral swine known to roam their land, or at a minimum allow someone else to shoot or trap it.

The potentially destructive outsiders have a knack for taking advantage of every method of transportation to get to a new location where they thrive - including the treads of off-road vehicles.