a few things. . . .find the water sources, then look for the wallows. Near those you will find where they rub on trees. They love to rub telephone poles with Creasote (SP?) on them. Then find those patches of earth where they have been rooting around, under Oak trees, around crops. etc. The trails will look like a highway, a sow and a bunch of piglets makes quite a path. The hoof prints, like Deer but not as pointed on the front. The scat, somewhere between a dog and a person, Dark and with a pretty good view of that last meals contents.