This reminds me of what goats have done to areas where they are turned loose to feed for "free" to be harvested later for "free" meat. On some formerly lush Carribean islands they have eaten every bit of vegetation until all that are left are heavily thorned bushes and trees. Natural selection in action.
In S.C., we hunt them from August to January, some areas using dogs and bait. And they're still overpopulated.