My crazy 98 year old neighbor has taken to shooting at them when they wander over the property line. Approx. 30 chickens and roosters, 12-14 ducks, and 2 Guineas.
I put up netting for my "fence" to keep my gals from wandering into my neighboring brothers yard..got it as deer netting at big r ..12.99 a roll, for 7..used Masons rope/string for top edge and landscaping staples for bottom edge..of course, it will never keep predictors out, but does keep my chix in feet by 50 ft..cut in half so I got a hundred feet out of a roll