A LARGE MOAT with hungry alligators would definitely work AND be a heel of a lot cheaper!!! We could round up the gators from FL. they would love to get rid of them!!! After a few mating seasons that moat would be full to the brim!!!
My Crocks against your Gators at noon ... may the best reptile win ... mine have been know to eat Gators as a light snack before moving on to larger prey like humans ...