Most farmers appreciate having varmints removed from their property, especially woodchucks, weasels, and coyotes. Getting permission for squirrels and rabbits may take some sacrifice on your part, take out the varmints and then ask about tastier critters. Pitching hay shows sincerity, though lesser chores could do the trick. Be polite, ask nicely, don't dress in camo. Once you get in cultivate the relationship like the gold that it is.