Pigs are pretty smart, even the traps have to be cleaned and moved after one or two catches as they will avoid a trap after a catch is made. I've seen trappers use a variety of natural and artificial camo and even cover scents on traps with limited success after the first catch, they usually have to leave for a week or two and reset in a different location. Russian boars have the same vital area as feral pigs only somewhat larger, as are the pigs. In Louisiana years ago I was teased by my fellow hunters, as I usually shot small to medium pigs, until one of them shot a large old boar, great tusks, smelly and hard to clean and meat had to be ground as it was tough and gamey; my pigs were easy to clean, tender and except for less fat, tasted like commercial pork. Some states have minimum size; if not go for the small to med pigs, unless you are trophy hunting. I've shot pigs in Florida for developers; in new subdivisions where they will totally destroy a landscaping job in a night, with a crossbow; I could get a second pig as the first pig would run and with no shot, the others froze for a few seconds, like above; one days kill required a relocation or two week wait to try again.