how much time have you got? crows etc can see your eyelid blink at 50 yards, with a rifle you have to sit for ages to get one shot off then thats it for an hour, traps ok but best placed where the thieving ones go and get them first, ive solved the problem of duck egg thieves by netting a large pen off, the ducks have a small exit and entrance hole that the rooks havent found, i gave up shooting and trapping them it takes forever to get nowhere. learn to live with them cos youll never get the upper hand.... pigs no problem