The sport of hunting ducks and geese is alive and quite well in North America, thanks in large part to a resurgence of waterfowl numbers, which, in turn, can be traced to conservation groups such as Ducks Unlimited and Delta Waterfowl, Inc., as well as to sportsmen who impose limits on themselves far stricter than those issued by the law. Assembling the gear, fixing the decoys, working with the Labs and Chesapeakes, caring for the firearms,...