Here's the info I must have seen. I copied this and am pasteing it to this post.

A hunting license is required of any person, regardless of age, who hunts any animal, bird, frog or turtle in this state (except furbearers, if the hunter possesses a trapper's license). No license is required for nuisance fur-bearing animals, depredating hogs or coyotes (see below). Non-residents under 17 years of age may purchase and hunt with the Special Resident Hunting License (Type 102).
A hunting license is not required to hunt the following:
[ul][*]Coyotes, if the coyotes are attacking, about to attack, or have recently attacked livestock, domestic animals, or fowl.[*]Depredating feral hogs, if a landowner (resident or non-resident) or landowner's agent or lessee is taking feral hogs causing depredation on the landowner's land[/ul]

It would be best to research this further for definitions of depredation and being a landowner's agent but it sounds to me that if a feral hog is tearing up crops, etc and you are helping out the landowner to get rid of the hogs, you may not need a license at all. Of course, sometimes when one kills animals that are depredating, you can't actually remove the animal. That may not be the case here, but if I were you, I'd check for sure before I shot one and carried it off.